Clamp the 3D Square directly into your projects: boxes, drawers, casework, cabinets, frames, bookcases... The 3D Square holds the assembly for you! Your hands are free to place screws, nails, glue, etc. Precision right angles every time! Clamp the 3D Square in place to hold any 90 degree project. Construct jigs, use as a miter guide. The 3D Square holds precise corners! Helpful in projects of any size, as long as you want it SQUARE The first 3 dimensional square! And the first assembly square on the market. Stamped of 3/16th" aluminum, and machined to a tolerance of .002" along the entire 6" edges for the precision of an engineer's square at a fraction of the cost, and much more versatile! Made in the USA (in Kansas City, Kansas) Always in Stock!