Store Locator
Special Price $9.99 Each Regular Price $12.99 SAVE $3 (23.09%) Each
In stock
Clamp-It® Bar Clamps sold separately

Get Expert Advice

Return Policy

Rockler Clamp-It® Assembly Square

Align it, clamp it, and fasten it to get perfect 90° angles every time!
Item #
88% of 100
Here's a solution that's so simple, you'll wonder why it took so long to develop! The Clamp-It® replaces custom clamping jigs, acts as a third hand, and eliminates the need for long bulky clamps. Simply put, the Clamp-It® is a square you can clamp. In fact, you can even assemble a cabinet one corner at a time! Works with any joinery technique, from nails to hand cut dovetails.

It's ideal for every stage of construction, from assembling plywood cabinets to face frames and drawers. Clamp-It® is also perfect for framing decks and installing rails and balusters. Attach it to a work surface, and it becomes a right angle fixture for bench assembly. Clamp-It® is computer designed and manufactured from high impact, rigid polycarbonate to ensure strength and accuracy. Size of the Clamp-It® is 8" X 8" X 1 - 1/2".

Great for:

  • Drawer Assembly: Clamp-It® is designed for use on either the inside or outside of a corner, making it ideal for assembling drawers with lipped fronts.
  • Deck Rails: Use Clamp-It® to hold deck balusters at a perfect 90° angle while fastening.
  • Bench Jigs: Clamp-It® can be secured to any work surface to create a simple 90° assembly jig.
(1) Clamp-It® Assembly Square
More Information
Brand Rockler
Weight 0.8000
Length 8"
Style Square
4.4 / 5.0
399 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
This is a simple idea
I have done this ny cutting wood blocks
But the plastic gizmo is actually easier thanks
October 9, 2019
4 weeks ago
Love Rockler Clamp-It Square
Made out of great quality material! Strong yet light-weight!
Made my job very easy and fast while framing shed walls!
October 5, 2019
1 month ago
Woodworking Experience:
worked great on a cabinet box
September 17, 2019
1 month ago
Woodworking Experience:
they are great work with them on jobs and no problems
September 6, 2019
10 months ago
Woodworking Experience:
very good. helpful.
easy to use and manage almost clamping situation.
August 29, 2019
2 months ago
Woodworking Experience:
The Clamp-it system is THE best!
I have tried all sorts of clamping systems to make boxes with true 90 degree corners. Each of them was deficient in some way or another. In desperation, I tried the Clamp-it system, and I was able to make a really nice box in a matter of a few minutes. You need one of these ahd one of the Clamp-it clamps. It helps to have two to work with so the work goes twice as fast.
August 21, 2019
8 months ago
Woodworking Experience:
Terriffic product
Great product!
August 7, 2019
3 months ago
Woodworking Experience:
An extra set of hands
The Clamp-it square works exactly like I expected it to. It’s simple design makes constructing a 90 degree angle easy. It’s something I use every day.
August 6, 2019
3 months ago
Woodworking Experience:
Use all the time —. For me a must have
July 28, 2019
8 months ago
Very happy
Very happy great addition to the shop
July 3, 2019
4 months ago
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 6 questions Browse 6 questions and 60 answers
Why did you choose this?
Rockler Store
just needed a couple more of these. They're very handy
Jack Wein W on Oct 15, 2019
Great accessory to the jig.
Phillip M on Oct 13, 2019
just needed a couple more of these. They're very handy
Jack Wein W on Oct 15, 2019
I do not own very many Rockler products but would like to in the coming months now that fall has arrived and the winter will soon follow. Time to start building!
Don L on Oct 14, 2019
Great accessory to the jig.
Phillip M on Oct 13, 2019
Plan on building cabinets for shop
Richard W on Oct 13, 2019
wanted to have a set of four
Kathleen H on Oct 12, 2019
Really saw the value in the Clamp-It Jig system.
Lorne S on Oct 10, 2019
Keeping my cabinet square
Preston C on Oct 9, 2019
Building miter saw station carcasses.
R D on Oct 7, 2019
your mom
josh g on Oct 5, 2019
Needed it for my corner clamps.
William D on Oct 4, 2019
Sawdust Girl Recommendation
Joe T on Oct 4, 2019
Needed to complete my set.
Miguel R on Oct 2, 2019
I have a lot of cabinets to build.
Jeffrey H on Oct 2, 2019
Wanted to try these out, been using a combination of a speed square and a framing square for assemblies, thought these would do a better job.
Paul c on Oct 1, 2019
Tools to help clamp and hold a 90, while I’m fastening should be very useful and save time.
Josh H on Sep 29, 2019
Phillip M on Sep 25, 2019
Have one, need another.
Jack V on Sep 22, 2019
Making cabinets. Need "extra pair of hands"
Myron D on Sep 15, 2019
Donna V on Sep 12, 2019
Making some things easier to deal with, and this is one of those things that help.
Richard G on Sep 1, 2019
they work good for squaring up cabinets
Brian K on Aug 29, 2019
Wanted another one
Lee S on Aug 29, 2019
Look like these will do the trick also, I'll see.
Ronald P on Aug 16, 2019
Need an aid to square cabinet boxes.
Stephen J on Aug 14, 2019
BILL on Aug 7, 2019
Too go with my corner clamping bar
Lloyd B on Aug 5, 2019
Upcoming projects
Ronald S on Aug 2, 2019
Need to complete the Clamp-It® Corner Clamping Jig with Clamp-It® Assembly Square
Phillip S on Jul 19, 2019
Will help a lot with the small projects I have around the house.
Robert F on Jul 6, 2019
To complete Clamp-It Corner Clamping Jig set up
J.R. N on Jul 5, 2019
To help keep projects circular!
Rich C on Jul 2, 2019
For squaring modules
Michael A on Jun 28, 2019
Husband uses these on his projects.
Staci W on Jun 22, 2019
For future project
Thomas L on Jun 20, 2019
Easy to use
Mark J on Jun 19, 2019
Making some cabinets
Daniel P on Jun 16, 2019
Excellent method holding aggravating corners
Gary on Jun 16, 2019
It goes hand in hand with the corner clamp jig
Francis P on Jun 16, 2019
Great reviews and upcoming projects.
Roger R on Jun 14, 2019
It goes with the corner clamp
Debra B on Jun 14, 2019
Used them in the past easy to use. Lost my last pair in a move
MIKE K on Jun 14, 2019
after watching a short video on the use of the jig system this will help me on cabinet assy when working by myself
Donald Hauke A on Jun 12, 2019
quality merchandise
William S on Jun 10, 2019
making kitchen cabinets
Timothy F on Jun 9, 2019
Have 2 - Need to complete a full set - They work great
Jonathan D on Jun 1, 2019
Very useful when making chicken coop door frames.
Daniel W on May 31, 2019
To use with the Corner clamping jig
Chuck M on May 30, 2019
Jig 9+0 Degree Angle
Terry K on May 28, 2019
needed a few
craig h on May 26, 2019
I need it for the corner clamp I bought.
Mike D on May 25, 2019
I do not own very many Rockler products but would like to in the coming months now that fall has arrived and the winter will soon follow. Time to start building!
Don L on Oct 14, 2019
Plan on building cabinets for shop
Richard W on Oct 13, 2019
When should I use the Clamp-it Corner Clamping Jig vs. the Clamp-it Bar Clamps?
Jerry on Apr 28, 2017
BEST ANSWER: I work for Rockler. When the material is over 2" wide to be clamped, use the bar clamps. I fit is under the clamping jig works very well.
How many are in a package?
A shopper on Jul 29, 2015
BEST ANSWER: Just one. Clamps must be purchased also. Other clamps will work.
What are its complete mesures, 8"x8"x1.5"x?"...?
Carlos Otto C on Jun 21, 2018
What thickness of stock will this accommodate?
Ian L on Apr 14, 2019
BEST ANSWER: You can use this with any thickness of stock as long as you have a clamp that will open wide enough to clamp to it. If you are planning on using it with the fence clamps from Rockler you are limited to about 2 inches of thickness. You can also screw this to the stock which also allows for almost any thickness. It will usually support stock that is of reasonable size. I think I have used these to support 2.x4x3/4 inch plywood panels when making a set of shelves for my shop.
Does the screw holes line up to the holes in the clamp-it corner clamping jig ?
Larry K on Jan 16, 2019
BEST ANSWER: Yes, and the jig comes with the screws you need.
Prop 65 WarningWARNING: Cancer & Reproductive Harm -