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Rockler Adjustable Clamp-It® Assembly Square

Rotates from 45 degrees to 315 degrees to help clamp almost any angle.
Item #
88% of 100

There are few things more difficult than holding pieces of a project at odd angles while trying to assemble with a nail or screw. The Adjustable Clamp-It rotates from 45º to 315° and locks in place at the angles you'll need most!

  • Works with any joinery technique.
  • Easily assemble pedestal bases, staircases, decks, cabinets, drawers and more without custom clamping jigs!
  • Replaces custom clamping jigs, acts as a third hand, and eliminates the need for long clamps.
  • Measures 8" x 8" x 1-1/2".
  • Clamp it and fasten it at 90 degree and multiple angles.
  • Manufactured from high-impact, rigid polycarbonate to ensure strength and accuracy.
  • Clamp and fasten projects with odd angles or typical 4-, 6-, 8- and 12-sided frames.
  • Knob twists for tightening and loosening, while interlocking teeth securely set angle.
(1) Rockler Adjustable Clamp-It® Assembly Square
More Information
Brand Rockler
Weight 0.7500
Length 8"
Style Square
4.4 / 5.0
99 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Does its job
March 15, 2020
1 month ago
Woodworking Experience:
buy it on sale before you need it
This is a good clamp for odd sizes. It is wide enough and braced enough that it doesn't twist when pressure is applied. I never thought I would need to clamp anything @ 40°... this guy did the trick.
February 19, 2020
2 months ago
Woodworking Experience:
Nice tool
Extremely helpful tool. Cheap but powerful
December 23, 2019
3 months ago
Worked perfectly on clamping the boards for Flag Display case.
December 7, 2019
4 months ago
Woodworking Experience:
Performs as expected
October 17, 2019
1 year ago
Woodworking Experience:
June 14, 2019
1 year ago
Woodworking Experience:
Adjustable clamp
Very useable & versatile
March 19, 2019
1 year ago
Woodworking Experience:
Burly and reliable
Very handy fo those odd jobs. I sometimes make display pedestals out of MDF with odd angles. These have made clamping much less stressful! Roy
January 27, 2019
over 3 years ago
Woodworking Experience:
Unique and useful solution
I really like the number of ways this can be used to clamp pieces
December 20, 2018
1 year ago
Woodworking Experience:
Great idea
Works as expected. No issues this far.
December 12, 2018
1 year ago
Woodworking Experience:
Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 8 questions Browse 8 questions and 66 answers
Why did you choose this?
Rockler Store
Will be nice to make boxes that are not 90° angles.
Andrew N on Feb 26, 2020
plan on making hexagon box for Rockler BT speaker kit, thought this would be useful for clamping the 60 degree joints
Dan R on Feb 12, 2020
Will be nice to make boxes that are not 90° angles.
Andrew N on Feb 26, 2020
Quality and craftsmanship.
Michael L on Feb 18, 2020
plan on making hexagon box for Rockler BT speaker kit, thought this would be useful for clamping the 60 degree joints
Dan R on Feb 12, 2020
making a corner cabinet
vic c on Jan 27, 2020
PATRICIA G on Dec 16, 2019
Our technical theatre director asked us to order for him.
S R on Sep 12, 2019
there is always that one project that comes along and you spend time making a jig this would solve it
James H on Jul 4, 2019
Deb C on Jun 26, 2019
Great idea
Mark J on Jun 19, 2019
I’ve been making my corner “definers” for 30, 45 and 60-degree joints. I want to try these to see it they make my life easier (hard to tell from online description).
Jay on Jun 16, 2019
Want to make sure my frames a square!
Gina M on Jun 13, 2019
Very useful tool.
Donald D on Apr 30, 2019
Making bins to fit oddly angled cabinets, this looks like it will help.
Valorie J on Mar 29, 2019
Great for holding and gluing up PVC exterior mouldings.
Joseph H on Mar 26, 2019
Bought the smaller versions non adjustable and really enjoying them. Sale this one on sale and wanted to add to my collection.
Duston on Mar 25, 2019
Better accuracy
Ron C on Mar 13, 2019
I needed It
Karl K on Feb 26, 2019
Making cabinets and boxes of various shapes
Keith T on Feb 24, 2019
I am going to use it to clamp angle joints
Don E on Feb 10, 2019
I will be building cabinets with 30 and 60 degree angles
Michael C on Feb 3, 2019
New to wood working, looking for projects, tools and plans
Ralph E on Jan 8, 2019
I need an adjustable angle clamp for 22.5 degree for flag box
Vincent M on Jan 1, 2019
Ideal for angles
Bill E on Dec 28, 2018
Looked like something handy for wood work
Douglas K on Dec 23, 2018
On husband's wish list
Kathel S on Dec 17, 2018
To hold projects during glue up.
Jeffrey D on Dec 11, 2018
I hope this is easy way to find angles. I'm not very good with geometry.
Dennis Flaugher L on Dec 9, 2018
I make a lot of bookcases. I think this will be great to help me line up the shelves.
Mary Lou E on Nov 18, 2018
I have the 90 degree square already and thought that this would provide additional options.
michael k on Oct 25, 2018
Just looks like a great idea! Always struggle with getting the angle right. This should be very helpful.
Debbie K on Oct 20, 2018
At times getting the correct angle is difficult. this looks like it can solve that problem
gene b on Oct 15, 2018
For box assembly
Jeff Stevens on Oct 15, 2018
Husband asked me to order. Has personal woodworking shop. Uses various sizes of clamps.
Rosalie S on Oct 5, 2018
One man workshop......any questions?
Nathan V on Oct 1, 2018
I need corner clamps with adjustable angles for boxes with 5 or more sides.
Steven R on Sep 30, 2018
Tried out this adjustable assembly square and liked it. Want to get a couple more.
Gene S on Aug 1, 2018
Ease of assembly.
Richard H on Jul 30, 2018
wanted to try them out
mahku on Jul 30, 2018
To stop the guess work when setting up angle cuts
Linda H on Jul 29, 2018
Making drawers
Roger B on Jul 25, 2018
To assembly my wood projects.
Carlos Otto C on Jul 25, 2018
It looked useful and it made my order large enough to qualify for free shipping.
Gordon S on Jul 24, 2018
Rex P on Jul 22, 2018
Seems like a very acurate tool compare to what I use
Benny G on Jul 22, 2018
To set up projects faster and too make my life easier.
Steve M on Jul 22, 2018
to hold two handrail pieces to be fastened with glue and screw.
Robert R on Jul 19, 2018
wanted to try it
JOHN H on Jul 19, 2018
I will use it on a 22 1/2 degree angle.
Mike W on Jul 18, 2018
eliminates the need to make clamping fixtures
Richard T E on Jul 17, 2018
I think it would be a great versatile tool
Manny on Jul 16, 2018
Quality and craftsmanship.
Michael L on Feb 18, 2020
making a corner cabinet
vic c on Jan 27, 2020
Can these adjustable Clamp its, be used with and attached to the Clamp-it corner clamping jig!?
Mark W on Aug 7, 2016
Does it come with the two clamps as depicted in the photo ?
Ralph on Jun 18, 2015

We also bought non-adjustable squares that had clamps included. However the adjustable one did not have clamps included. Note that any clamps of appropriate size will work. Hope this helps you.

Can't figure out what Clamp-It square to order for putting drawers back togeter?
Robert L on Nov 30, 2015
BEST ANSWER: I didn't remember that there were multiple sizes, but whichever will fit will work great. The last project I did with mine was to build an octagonal frame. It turned out great. I've used mine both inside a frame and outside a frame.

Is there an angle guage on this so i can set a specific angle?
Byron K on Nov 8, 2015
BEST ANSWER: Yes. It's embossed labels allow you to identify and select any angle from 45 to 180 degrees. The rotating joint is also notched to help you predictably lock your preferred angle in 1 degree increments.
As you adjust it, will it have a notch to indicate that you reached 90 and/or 45 degrees?
Carlos Otto C on Jun 15, 2018
BEST ANSWER: Yes, and it has lines marked with angle degrees that align with a mark
Will the f style clamps work with these?
Justin B on Mar 8, 2017
BEST ANSWER: Yes, with these cautions.
Be sure that the throat depth of the clamp is sufficient to position the adjustable assembly square to allow fastening. And be sure that the bar length of the clamp will accommodate the combined thicknesses of the assembly square and the material being fastened.
Can I set 22.5 degrees on this clamp?
JCap571 on Jun 25, 2018
BEST ANSWER: No, the smallest setting is 45 degrees
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