Special Price $23.99 Each Regular Price $29.99 Each
In stock
Firmly holds panels at a precise right angle, freeing up your hands so you can drive fasteners.

Rockler Clamp-It® Corner Clamping Jig

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
  • 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
Manufacturer Part Number No
Weight 1.5000
Tech Spec
  • Material: Glass-filled polycarbonate
  • Max Panel Thickness: 1''
Tech Docs Adapting the Rockler Clamp-It® Corner Clamping Jig Guide
Capacity No
Grip Style No
Jaw Depth No
Clamp Pressure No
Type No
Jaw Width No
Length No
Prop 65 WarningWARNING: Cancer & Reproductive Harm - www.P65Warnings.ca.gov

4.5 / 5.0
178 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Clamptastic - 2 in 1, worth the money
These work great with the L clamps that Rockler sells, great for doing corner work with the two built in clamps that help keep the corners lined up, even and secure for glue work, pocket screws for both hard and soft woods. I have recommended to other wood workers as these are pretty stable, reliable, and hold together tight, better than many other clamps I have tried for these type of projects. Highly Recommend.
September 19, 2018
1 week ago
Woodworking Experience:
used it to assemble flag display case
July 15, 2018
3 months ago
Woodworking Experience:
The corner clamping tool is one of the best tool it make the job go faster . Love it will need to buy couple more.
July 9, 2018
over 2 years ago
Outstanding cabinet clamping aid that works great.
June 18, 2018
3 months ago
Clamp set
Work great solid investment
April 27, 2018
5 months ago
Woodworking Experience:
Very helpful
These were excellent for assembling base kitchen cabinets. I added a four inch riser (accounting for toe space) to support the cabinet bottom...worked perfectly.
April 19, 2018
7 months ago
Woodworking Experience:
Corner Clamping Jig
It's Great, I have used it for two projects now and these are extra hands and keeps my work square. Fantastic Product
April 17, 2018
5 months ago
Woodworking Experience:
Solid built and smooth operating
March 22, 2018
6 months ago
Woodworking Experience:
These are like having another set of hands in the shop.
March 20, 2018
over 2 years ago
Woodworking Experience:
A very nice helper
Before I bought this, I was using my own diy wooden jig. This corner jig won't swell crack and break like Oak wood. Works really well on big 34/-inch plywood cabinets, chest and boxes of that sort.
March 12, 2018
6 months ago
Woodworking Experience:
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Browse 13 questions Browse 13 questions and 80 answers
Why did you choose this?
Rockler Store
I have two and love them... Want to make a four corners assembly set.
Harry on Jul 21, 2018
I have two Clamp-it corners that I use with fence clamps. I want one of these so the piece can stand on it's own on the bench top rather than hanging the corner over the edge of the bench with me gripping it with all my fingers, toes, knees and elbows to hold it up!
Michelle G on Jun 22, 2018
I have two and love them... Want to make a four corners assembly set.
Harry on Jul 21, 2018
good innovation
ensin w on Jul 5, 2018
I have two Clamp-it corners that I use with fence clamps. I want one of these so the piece can stand on it's own on the bench top rather than hanging the corner over the edge of the bench with me gripping it with all my fingers, toes, knees and elbows to hold it up!
Michelle G on Jun 22, 2018
had 2 of assembly squares and clamps wanted to make assembly easy
George H on May 31, 2018
Needing these for a job and I have two assembly squares already.
Fred L on May 31, 2018
cabinet construction.
Donald K on May 27, 2018
I now have 4
Charles J on May 26, 2018
Great way to align project to improve assembly time!
Raymond G on May 26, 2018
To whole my assembly squares in place.
Jimmy W on Apr 28, 2018
Needed additional units
Roger M on Apr 8, 2018
I had seen a video
mike w on Apr 3, 2018
needed it
turner j on Apr 3, 2018
I'm making drawer boxes.
Steve H on Mar 16, 2018
For help in assembly
John F on Feb 22, 2018
Project working on
JIm J on Feb 18, 2018
it seems to be the best on the market. I'll know more after I try it.
Michael P on Feb 12, 2018
Have one and wanted An additional one to make a set, liked the quality .
Matt K on Feb 11, 2018
Saw this in a flyer that came with recent order. I've used the clamp-it squares for years, and this seems like a good upgrade for them.
Steven K on Feb 11, 2018
About to build cabinets and drawers and want to speed up assembly
Bruce B on Feb 11, 2018
Useful in upcoming projects.
Robert S on Feb 9, 2018
to build garage cabinets
Anthony A on Feb 8, 2018
Building Cabinets in the shop and garage
Donald C. L on Feb 4, 2018
Need to build cabinet boxes
mwmo on Feb 3, 2018
I'm building some cabinets for my shop and I thought these items would help make assembly much easier since I'm a one person shop.
Dolin R on Feb 3, 2018
I have one now & a second one would be helpful
Lawrence J on Feb 3, 2018
to make picture frames for my wife's painting
Donald M on Feb 2, 2018
Needed an easy helper that doesn't bother me when I need an extra hand. LOL
Thomas S. P on Feb 2, 2018
Making cabinets for storage in kitchen
Emmett B on Jan 31, 2018
Easier to have two to keep square
Carl w on Jan 30, 2018
Making a cabinet that needs to be square. I already have the Clamp-It assembly squares. These will elevate project and ensure square assembly.
Umpire.20 on Jan 30, 2018
Necessary for current upcoming projects
Robert L on Jan 28, 2018
Very important to building a quality projecr
Craig M on Jan 28, 2018
to build square cabinets
Joseph S on Jan 24, 2018
going to make some cabnets
Stephen R on Jan 24, 2018
I needed a way to easier line up work..
Hugh C on Jan 23, 2018
It works!
Gary G on Jan 22, 2018
Building a Kitchen Island. I received the squares as a gift. Did some research and found that everyone loves this corner clamp...
rodney j on Jan 21, 2018
I like the help it provides
Michael C on Jan 20, 2018
This just makes sense to have if you are working by yourself and need to hold corners together.
Pamela F on Jan 18, 2018
Easy way to keep cabinets/bookshelves square.
Dennis M on Jan 13, 2018
I was watching April Wilkerson on her YouTube channel and she was using them.
Christophe B on Jan 8, 2018
Can always use a third hand to assist with assembling cabinet members.
William R on Jan 6, 2018
good ratings / value and can always use an extra pair of hands
Jerome M on Jan 2, 2018
Had 3, needed 4
Jess P on Jan 2, 2018
Just what I need.
Art D on Dec 31, 2017
to help me square and hold a corner of a shelving box or box while I secure it with a nailer or screw.
Arturo M on Dec 30, 2017
For constructing book shelf corners
Shawn P on Dec 29, 2017
I've been looking for something to help with corner clamping and this looks like it should do the job!
Mark Y on Dec 28, 2017
Functionality; sale
Joe S on Dec 28, 2017
I already have the right angle blocks that can work with the clamp so wanted to added convenience of the jig
Rebecca C on Dec 28, 2017
good innovation
ensin w on Jul 5, 2018
had 2 of assembly squares and clamps wanted to make assembly easy
George H on May 31, 2018
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
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
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.
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!
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.
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.
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