DICATTE90 Degree Positioning Square Right Angle Clamp 7.1" x 7.1" Aluminum Alloy Woodworking Carpenter Tool,4 Pcs Right Angle Clamps With 8 Clamps,For Picture Frame Box Cabinets Drawers

You don’t need a $200 square to check the 90* accuracy of these or any other positioning/clamping squares.A simple 4 test observation procedure will determine their precision.Position one square inside the other and look for offset gaps.Swap one square from inside to outside and observe.Flip one square and repeat above procedures.Both of my positioning squares are a true 90* inside and out.Only downside is that there is not a slot in the center for adjustable positioning on a cnc. But, I knew that from the picture.

I bought these to accompany a Woodpecker’s set to build a crate roughly 2.5 feet on each side from 3/4” plywood. I made the purchase given the price point and Prime overnight delivery.For somewhat precise positioning, they are OK. However, the heft of the clamps falls far short of the (much higher priced) competition. I simply could not align the boards either precision of my other set.Is it worth $100? Not to me but maybe for smaller work or for someone that seeks somewhat less precision, they’d be a good value. I returned them.

Bought 4 boxes (16 pc). 4 pc come in a box. Each box had one defective threaded knob. There must be an error in the manufacturing process. I have enough to overlook this but this is an FYI. The 90 degree blocks are well built and dead square.

I received a set as a gift, and liked them so I ordered the second set to have enough to complete projects. I built my own holder as pictured. I would have liked them to come as a 4 pack set to save a few dollars, but it is only available as a 2 pack.

I have a background in industrial design. The threaded 1/4 clamps need a longer return on the right angle so you can push the clamp further down inside what you are clamping rather than just on its edge. There are any situations where you need to place the clamp further inside rather than just on the edge of a piece of plywood. These won't work for that. Add another inch or two? I ended up using these with regular clamps because they clamps they come with aren't strong enough or deep enough. They also slip and move around because the red metal clamp has friction with the tightening mechanism. That's a poor design when trying to hold things together and its causing things to move.