I had been looking for angle fixtures to improve the squareness of the fabrications that I have been doing. I went ahead and purchased this one (the smaller of the two sizes) and I am incredibly pleased with it. I recently used it to fabricate an aluminum frame of 1.5" x 1.5" square tubing. After I completed the perimeter frame of 48" x 60", it was square to less than 1/8" and that could have been due to the weld cap height on the corner welds. One thing that is not mentioned in the website description is the squareness tolerances for the fixture. I was quite pleased with how close the tolerances are in all dimensions. I am currently looking at other fixture clamps and vises.