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Drilling of 3/8" holes may be required in older Clamp-Its for use with this product.

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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
(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
262 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
It worked just as advertised. A great third hand.
October 22, 2019
1 month ago
Woodworking Experience:
Just what is needed
Bought this to help with my biggest project todo - a new kitchen for the house. Really helps, making the carcasses easier and quicker to build.
October 20, 2019
3 weeks ago
Woodworking Experience:
Corner Jig
These work unbelievably well. Using two works well as long as you put blocks under the ends with no clamps which is easy to do. However, using four is much better. Well worth the cost!
August 31, 2019
2 months ago
Woodworking Experience:
Tight corners
I am always at a loss over how to get two pieces of wood to line up and stay tight while I attach them together. Rockler Clamp-it corner answered that problem. Kept both sides upright and tight against each other as I added pocket screw holes and pocket screws.
August 22, 2019
2 months ago
Woodworking Experience:
This goes with the Clamp-it corner jig to make excellent corners
Get a couple of these and a couple of the clamp-it ninety degree blocks and your corner making problems are over. I got my clamps yesterday. I tried them out today. I was able to make a box with perfect ninety degree corners in a matter of minutes.
August 21, 2019
2 months ago
Woodworking Experience:
Great product.
August 18, 2019
3 months ago
Great product for a good price!
August 6, 2019
3 months ago
Woodworking Experience:
great tool
used it and works great. would recommend to anybody doing boxes
August 6, 2019
3 months ago
Great Product
These corner clamps work great for putting cabinet boxes and drawers together.
July 19, 2019
3 months ago
Woodworking Experience:
I recommend this for any project.
Great product. Handy
July 11, 2019
4 months ago
Woodworking Experience:
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 19 questions Browse 19 questions and 93 answers
Why did you choose this?
Rockler Store
To go with the clamp-it assembly squares
Robert S on Oct 21, 2019
Need another hand in the shop when you work alone and this is the it.
Robert S on Oct 21, 2019
To go with the clamp-it assembly squares
Robert S on Oct 21, 2019
its a gift to ron
RON H on Oct 21, 2019
Need another hand in the shop when you work alone and this is the it.
Robert S on Oct 21, 2019
Already have one and love it. Now with the sale I have the pair at a bargain price.
James N on Oct 20, 2019
quality and have a set, these are for my son
Jim on Oct 20, 2019
good description, I thinks it will help me to keep the corners lined up perfectly.
J D on Oct 20, 2019
need square corners for cabinets
Jack C on Oct 19, 2019
It looks much easier to keep things square single-handedly
BRIAN H on Oct 19, 2019
This item should help me complete my corner projects with ease...making them square
phillip a on Oct 17, 2019
I've heard and seen these in action and want to try them out. I have a project coming up that I can use them on, so we will see if they realy work.
Jim F on Oct 15, 2019
I work by myself and it looks as if it will help me in assembly
Harry W on Oct 14, 2019
Excellent 2nd pair of hands!
Phillip M on Oct 13, 2019
wanted to have a set of four
Kathleen H on Oct 12, 2019
To make easier for me to build my cabinets.
John C on Oct 10, 2019
Gonna start making straight cornered boxes
Lorne S on Oct 10, 2019
I have two of these corner clamping jigs and they work great. I'm ordering two more. I'm building new cabinets for our house!
Paul C on Oct 8, 2019
I use the Clamp It squares all the time for putting plywood boxes together. This looks like it will help a lot with the process.
Cecelia S on Oct 6, 2019
To help me with projects where everything needs to be square
Ronald M on Oct 4, 2019
Sawdust Girl Recommendation
Joe T on Oct 4, 2019
Needed four extra hands to hold my projects (I bought 4 of course).
Miguel R on Oct 2, 2019
I have a lot of cabinets to build.
Jeffrey H on Oct 2, 2019
Building an Armoire and need to ensure corners are square.
Randy Y on Sep 29, 2019
Needed a third and Fourth hand
MARVIN B on Sep 29, 2019
I needed two more to have a complete set. These do the job that they are designed to do.
Morris M on Sep 27, 2019
Phillip M on Sep 25, 2019
Need more than 2 hands
David E on Sep 16, 2019
Making cabinets. Need "extra pair of hands"
Myron D on Sep 15, 2019
Looks like it will help me build cabinets.
Bryan B on Sep 9, 2019
needed it
Bobby H on Sep 1, 2019
use with Clamp-it
Sam ( on Aug 18, 2019
I'm 71 yrs old some time I need help holding boards it look like these will help me.
Ronald P on Aug 16, 2019
Wanting something to help make corners more square
J.R. N on Jul 5, 2019
I wanted to add this to my clamping accessories.
Kimberly C on Jul 1, 2019
Great design and works like a charm.
Joseph L on Jul 1, 2019
Does what I need it to do.
PAUL C E on Jun 28, 2019
I have the other pieces I just needed the clamp part.
Walter R on Jun 28, 2019
I work alone
Deb C on Jun 26, 2019
Seems like the best jig for making square cabinets.
Dennis K on Jun 24, 2019
Great item
Mark J on Jun 19, 2019
Excellent method holding aggravating corners
Gary on Jun 16, 2019
It is my third hand
Francis P on Jun 16, 2019
Have one and like it
James M on Jun 14, 2019
building cabinets
Oscar R on Jun 14, 2019
Much easier box construction
Richard S on Jun 11, 2019
making kitchen cabinets
Timothy F on Jun 9, 2019
Building Cabinets
William H on Jun 4, 2019
building cabinets
Don K on Jun 3, 2019
I already have two and I needed two more.
Brian C on Jun 2, 2019
it's to make dresser draws.
Philip H on Jun 2, 2019
To supplement my Clamp-It brackets
Robert P on Jun 2, 2019
its a gift to ron
RON H on Oct 21, 2019
Already have one and love it. Now with the sale I have the pair at a bargain price.
James N on Oct 20, 2019
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
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)
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.
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.
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
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 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
¿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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