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Rockler Clamp-It® Corner Clamping Jig

Firmly holds panels at a precise right angle, freeing up your hands so you can drive fasteners.
Item #
90% of 100

Struggling to hold cabinet parts in alignment while driving fasteners can be an exercise in frustration, and if you're using a nail gun, downright dangerous. The Rockler Clamp-It® Corner Clamping Jig eliminates that frustration by providing another set of ''hands'' to hold your parts together. It's used with the enormously popular Clamp-It® (#29190, sold separately) to hold panels at a precise right angle for fastening. Used in sets of four, the jigs are supportive enough to hold an entire case assembly as it is being assembled. The clamps have soft pads to prevent workpiece marring. Mounting holes in the jig allow for attachment to your work surface.

  • Extra-wide base, high walls and strong Acme threaded clamp screw hold panels securely
  • Thick cushioned pads to prevent marring
  • Durable glass-filled polycarbonate construction
  • Mounting holes allow for attachment to work surface for creating assembly jigs
  • Jig holds panels exactly 3/4'' off the work surface so you can use scrap boards to support other corners if using only one jig at a time
Notice: Drilling of 3/8'' holes may be required in older Clamp-Its for use with this product.
(1) Rockler Clamp-It® Corner Clamping Jig
(2) 1'' Screws for Attaching Clamp-It (#29190 not included)
More Information
Brand Rockler
Weight 1.5000
Tech Spec
  • Material: Glass-filled polycarbonate
  • Max Panel Thickness: 1''
Discountable Yes
4.5 / 5.0
311 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
I have used them for one job so far I multiple cabinets and they give the extra holding hands I need
February 20, 2020
2 months ago
Woodworking Experience:
This truly is an awesome product! I wish I had these years ago.
This truly is an awesome product! I wish I had these years ago.
February 19, 2020
1 month ago
Works as advertised. Love it.
February 8, 2020
1 month ago
Woodworking Experience:
Clamp-it corner jig
Nicely finished, well made, designed to use. You need to sell it with or without the assembly square.
February 2, 2020
1 month ago
Woodworking Experience:
Fantastic clamps
Those are so handy. Worth every penny. Hats off to Rockler for carrying all the specialty tools I need.
January 30, 2020
1 month ago
Woodworking Experience:
Won't build again without these.
Used these for the cabinet on an assembly table build and I couldn't be more pleased. Easy to use and spot on square.
January 30, 2020
1 month ago
Woodworking Experience:
Good tools
Makes assembling large pieces very easy
January 21, 2020
2 months ago
Woodworking Experience:
Clamp it jig
Bought one last summer to test it. Works well bought 3 more
January 19, 2020
2 months ago
Woodworking Experience:
The corner clamps have very handy
January 18, 2020
2 months ago
Woodworking Experience:
A great clamp
This is so helpful to designed to hold two boards exactly square until you get them secured..
January 8, 2020
3 months ago
Woodworking Experience:
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Browse 21 questions Browse 21 questions and 104 answers
Why did you choose this?
Rockler Store
clamp, glue and screw drawers
Patrick P on Feb 22, 2020
Building three medium treasure boxes as gifts
Dana G on Feb 20, 2020
clamp, glue and screw drawers
Patrick P on Feb 22, 2020
Easy to use
Andrew A on Feb 22, 2020
Building three medium treasure boxes as gifts
Dana G on Feb 20, 2020
Ordered 2 last week ,really liked them so ordered 2 more
Larry on Feb 18, 2020
future project
Michael H on Feb 18, 2020
Quality of life in the workshop improvements!
Jonathan R on Feb 17, 2020
To acquire close to perfect 90° angles. Trying to get everything squared
Lillian H on Feb 15, 2020
To square corners while assembling DIY cabinets.
Angel W on Feb 15, 2020
I chose this too work with the "Assembly Square".
Glen M on Feb 11, 2020
Making several boxes and this device will make it much easier for squaring and holding during production.
Jeff H on Feb 11, 2020
I needed it.
Carroll H on Feb 10, 2020
The reviews were excellent. Look forward to using it.
Jeff on Feb 9, 2020
I need to build some cabinets I hope these are better then box store corner clamps
Randy P on Feb 9, 2020
Will come in handy for holding my projects
Larry on Feb 7, 2020
Jeff F on Feb 7, 2020
Because I build a lot of cabinets and it seems like a good pair of third hands
for a birthday gift to my husband
Cindy D on Feb 5, 2020
saw item on you tube and like the ease given when joining large pieces
greg on Feb 3, 2020
For box building
Gant E on Feb 1, 2020
Making cabinets.
Richard H on Jan 31, 2020
I have two and can see where two more would be better!
Mike H on Jan 30, 2020
When I started woodworking, I never thought that making a square box would be so difficult. These should help nicely.
Mark A on Jan 30, 2020
Build a lot of boxes and cabinets. This looks to simplify.
Allen M on Jan 29, 2020
Will be making cabinets, this looks like a simpler way.
Jerry R on Jan 27, 2020
Been putting off purchasing this for a year or more. Great videos.
Joseph D on Jan 26, 2020
Bought one, had to have two.
Phillip N on Jan 25, 2020
To build my collection up to 4
Gary C on Jan 25, 2020
I already have one. I needed an extra 3.
Peter S on Jan 25, 2020
This completes my set of four.
John G on Jan 24, 2020
I saw April Wilkerson using this on YouTube looked to be an very helpful product.
Robert L on Jan 23, 2020
I do a lot of plywood boxes
James K on Jan 22, 2020
Everyone could use an extra set of hands
Robert D on Jan 22, 2020
Aid in project assembly while working alone
Carl K on Jan 22, 2020
I plan on building a set of upper cabinets for storage in my workshop in the near future.
Jason D on Jan 22, 2020
Have a set of four but the handle on the clamp screw broke. Need to replace the unit.
Larry G on Jan 22, 2020
Saw this demonstrated and the corners were very tight. Seems like a good tool.
Dan C on Jan 21, 2020
Should help putting together larger cabinets, they were on sale figured i would try them.
Mark O on Jan 21, 2020
ease of use
William W on Jan 21, 2020
To make cabinet for bathroom easier
Beth W on Jan 21, 2020
Needed extra
Gary on Jan 18, 2020
I already have 2 and I wanted a complete set. They make building boxes very easy.
Albert Stanley H on Jan 17, 2020
Did not have any of these. Getting ready to build some dressers, so these seemed like a good idea to have when dealing with multiple drawers.
Randy H on Jan 16, 2020
I have a welding corner clamp, but it tends to mar the wood. Got this one to use for woodworking.
Mike H on Jan 16, 2020
Watched several videos and this seems like a great product. Will update after use.
Ted on Jan 16, 2020
Got one for Christmas, so I got another to have a pair.
marty a on Jan 11, 2020
saw on video
S C on Jan 10, 2020
saw it on a video while assembling some boxes and thought it would be a very useful tool.
LINDA T on Jan 6, 2020
I build a lot of cabinets.
DIYer on Jan 6, 2020
To work with the clamp it assembly square tool
Boyd L M on Jan 5, 2020
Tired of juggling panels when screwing them together! 😂
Donald R on Jan 5, 2020
Easy to use
Andrew A on Feb 22, 2020
Ordered 2 last week ,really liked them so ordered 2 more
Larry on Feb 18, 2020
Would it be ideal to have 4 of these while building cabinets or only having two will do just fine?
Trevor O on Sep 15, 2015
BEST ANSWER: If you are building larger cabinets, four might come in very handy
Can item 69954 be used with this item? I ordered 2 of these plus item 69954. Kinda ridiculous this item doesn't include the black plastic squares are ready
Trevor O on Sep 15, 2015
BEST ANSWER: Yes 69954 can be used with this product
What size Replacement Knob to I need for this item?
Bill R on Mar 7, 2016
BEST ANSWER: When you received this item, there should have been an instruction manual with it. The manual should have a list of replacement parts. If not, simply call Rocklet Tech Support and they can send you the part you need. They can also supply you with replacement parts lists.
Can the Rockler Adjustable Clamp-It Assembly Square (Item #33586) be used with this? Or just the fixed 90º Assembly Square?
Lane B on May 7, 2016
BEST ANSWER: This was designed for the fixed Clamp-it
¿Can this work with the Mini Clamp-it item (27767)?
Carlos Otto C on Feb 14, 2019
Rockler Clamp-It® Corner Clamping Jig
Rockler Clamp-It® Corner Clamping Jig
Rockler Mini Clamp-It® Assembly Square
Rockler Mini Clamp-It® Assembly Square
BEST ANSWER: Yes. They even supply bolts to attach it if you wanted.
Are there any similar products that would work for assembling carcasses built from 2x4's?
mcilroy50 on Jan 22, 2016
BEST ANSWER: You can build your own narrower versions of the 29190 square add-on to clamp thicker materials if you need a higher lip on the backside. Otherwise you can go up to just shy of 3 inches without the 29190 square inserts. With the 29190's in place the maximum width is just shy of 1 inch. Not sure why Lyman L said small wood. So the answer is maybe, it you are talking about the 1.5" dimensional side of the 2x4, but not the 3.5" dimensional side.
Will the 58918 hold 3/4 inch plywood plus the 29190?
Thomas C on Sep 3, 2015
BEST ANSWER: Yes, it will hold up to 1" plywood plus the Rockler Clamp-It® Assembly Square (Item #: 29190)
What would be the smallest box you could make before the clamps would bump into each other? I'm thinking it would be around 18"?
groundhog on Feb 18, 2016
BEST ANSWER: Looks like about 8" X10.25" insde clearence. These clamps are excellent for aligning larger pieces that are to assembled with screws but are not good for asembling mitered boxes which require pressure from both directions. With that said very helpful in assebling cabinets etc.
Will this work with your mini squares?
Dapper Dan on Nov 28, 2018
BEST ANSWER: I used the squares I already owned. Worked like a champ.
Can I make accurately T-joints of different and equal thickness with this item?
Carlos Otto C on Feb 14, 2019
BEST ANSWER: I just use it with clamp it because I just make boxes for cabnets
Would I be able to use these with Woodpecker brand clamping squares? It would make setup time much faster than using separate clamps.
Ted K on Oct 17, 2016
BEST ANSWER: I bought two of these clamps and they have been a great help in many different projects. They certainly made the job much easier. They are easy to use.
I often build large wooden boxes with box joints. Will these work well to glue them square? Thanks!
carl c on Oct 5, 2015
BEST ANSWER: Hi Carl. These clamp-it jigs are very heavy duty and work great. You must also purchase the clamp-it square (below) to go with each jig. You need at least 2 of each to be effective. I purchased 4 of each to give more versitality. They are very pricey and I regretted purchasing them at first because of that, but they have proven to be very helpful when aligning large projects. I also purchased 2 sets of the mini clamp-it assembly sets.
Rockler Clamp-It® Assembly Square
Rockler Clamp-It® Assembly Square
Will this work with 2x4s?
Scott L on Feb 9, 2020
BEST ANSWER: No. The max dimension between the clamping screw pad and the removable square is just shy of 1". The lip that positions the square is approximately 1/4" high. Two machine screws secure the square in place, and transmit the clamping force to the base.. If the Square is removed, the lip would not make a suitable surface to stand up to the clamping force. All parts except for the screws and screw anchors are plastic. Not an easy design to modify.
Would these work with Kreg pocket hole assembly?
Ted K on Oct 28, 2015
BEST ANSWER: They work really great. It is like having an extra set of hands. Highly recommended for any shop!
What is the maximum thickness of wood it works with?
Joseph D on Oct 28, 2018
BEST ANSWER: Up to an inch. Works really great on 3/4 inch just like they say. A second pair of hands. I have 4 units. Great tool.
The material I need to clamp is 1 1/8" thick. What max. thickness does this accommodate?
John A H on Apr 3, 2019
BEST ANSWER: it's meant for 3/4" material and looks like it would take 7/8" thick but you could make your own clamp-it assembly square and make it slightly smaller and then your material thickness would probably work.
¿Can this hold thick panels accurately without use the 29190 item?
Carlos Otto C on Feb 14, 2019
BEST ANSWER: I suggest using the #29190 or the new 1/2'' Rockler Clamp-It Clips, 4-Pack #58225 or 3/4” #58849. They will make your life a lot easier when building cabinets.
Under the heading of "what's included", it states 1inch screws to attach Clamp-it (28120 screws not included). Are they included or not included?
George E on Jan 19, 2016
BEST ANSWER: The screws are included.
Part number 28120 does not appear to exist.
Part number 29190 in the current listing, which it says is is not included, is the black right-angle assembly square you see in the picture used with the corner clamping jig in question.
Would anyone be willing to share how exactly you can neatly hang these on the wall when not in use? I've been staring at them and then the wall over and over.
Mark F on Feb 22, 2020
BEST ANSWER: I keep mine in a clear plastic cantaner with my clamps. I guess you could use a board with wood dowels to hang them on.
I bought two of these corner jig clamps and they arrived with out the black angle pieces shown in the photos. Are they not included? The clamps appear to be useless without them.
Larry Q on Feb 3, 2018
BEST ANSWER: It's used with the Clamp-It® #29190, sold separately.
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