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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''
4.5 / 5.0
333 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Good tool, but a bit high in price for what you get. Nonetheless, it improves the effectiveness and utility of the Clamp-It squares for constructing cabinets and boxes.
April 4, 2020
1 month ago
Woodworking Experience:
Rockler Clamp It
I haven’t had a chance to use it, but I know how it works and I should be able to build something without having to wait for someone to help me hold the wood in place.
March 31, 2020
1 month ago
Woodworking Experience:
great clamp
I already had the black L brackets. When I saw this in the catalog, I knew it would help me out a lot in putting frames together. I have used them 3 times in the last month. I love them
March 31, 2020
1 month ago
Woodworking Experience:
Corner clamp
Well made works great
March 29, 2020
1 month ago
Woodworking Experience:
clamp it corner
just made 8 drawers did a very nice i am very happy with
March 26, 2020
1 month ago
Woodworking Experience:
An extra set of hands
These work great when you are trying to put a drawer box together by yourself.
March 25, 2020
4 months ago
Woodworking Experience:
Rockler Corner Clamping Jib
Bigger and tougher than I expected. Works great!
March 23, 2020
1 month ago
Best helper ever
Best helper ever
March 17, 2020
1 month ago
Woodworking Experience:
Clamp it
I really like these I’ve only used these a couple times
Plans are to make a king size under bed storage unit with head board storage and do away with nightstands
I’m sure they are going to make it a lot easier
A bit pricey but worth every penny very happy
March 10, 2020
2 months ago
Woodworking Experience:
Strong clamps
This clamp saves so much time and keeps cabinet assemblies held aligned perfectly.
March 10, 2020
1 month ago
Woodworking Experience:
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 21 questions Browse 21 questions and 105 answers
Why did you choose this?
Rockler Store
Quality and sale price.
Kenneth O on Apr 4, 2020
It will help to do the corners
Gary H on Apr 3, 2020
Quality and sale price.
Kenneth O on Apr 4, 2020
To complete the set that my wife bought me for my birthday.
Robert F on Apr 3, 2020
It will help to do the corners
Gary H on Apr 3, 2020
It looks easy to use, you don't have to use clamps to make a perfect square.
Mazen N on Apr 3, 2020
saw video
james c on Apr 1, 2020
I’m doing a new project
Steve B on Apr 1, 2020
for shop cabinets I have to build
Jack Wein W on Mar 18, 2020
building tack trunks
kenneth t on Mar 9, 2020
I workalot alone in my shop, These would be like an extra set of hands. ( And I'm old LOL ) easier is better)
D U on Mar 8, 2020
I have the corner clamp and the holder just seemed to make sense
COLIN L on Feb 29, 2020
they are like having two extra hands
Kevin J. F on Feb 29, 2020
help to put cabinets together
david g on Feb 28, 2020
John P on Feb 27, 2020
J P on Feb 26, 2020
Make perfect corner on wood
JEFF on Feb 25, 2020
Well made. Speeds set up time considerably.
Thomas B on Feb 24, 2020
Make solo furniture construction so much easier!
Jonathan R on Feb 24, 2020
I hope to make accurate corners on all corners with these jigs.
MR M on Feb 24, 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.
Jack 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
To complete the set that my wife bought me for my birthday.
Robert F on Apr 3, 2020
It looks easy to use, you don't have to use clamps to make a perfect square.
Mazen N on Apr 3, 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.
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 got “ ALL THREAD 3/16 ROD Mounted the rod on some scrap plywood and a wing nut
Threaded them though the holes and snug them up. Mounted them on the wall cost about $3.00
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.
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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