90 Degree Positioning Squares Right Angle Clamps 5.5" Aluminum Alloy Woodworking Carpenter Corner Clamping Tool for Picture Frame Box Cabinets Drawers (4 Pcs Red)

I used these to make sure my 3D printer was completely square as I assembled it.

Everything about this package is top notch. So easy to use and super high quality.

The red aluminum pieces are very close to perfectly square and I am happy with those. Two of the threaded studs are not. They still work, but with the slight angle I could see it leaving some marks on wood when clamped tightly. I can throw it in a vice and bend it straighter, but still a little disappointing. Can't beat the prices, hence only removing one star.

Good product

I've built numerous cabinets, frames, and drawers with this to date, and these clamps have been absolutely essential in building everything square. I don't even know what you'd substitute this level of precision with (another piece of wood?), but if you're as OCD as I am, I would opt for these every time.

Works well, priced right.

Yep makes a right angle and holds it.

Needed an item like this to get truly square covered boxes and frames. These do a great job of that at a very reasonable cost.