Review on Duratec Precision Positioning Squares Set by Keith Desjarlais

Other reviewers noted that they aren't very accurate, which is fair. But they're plastic and cost $5 each, so set your expectations accordingly. They don't pretend to be the squares of an exact machinist. If you need precision, grab some 1-2-3 blocks or metal squares. One thing I noticed about mine is that they were all at least *consistently* not square. The inside corner is slightly sharp, which appears to be a design flaw (ignoring mold shrinkage). But they're close enough and cheap enough to wear comfortably around the store. Another downside is the cast "ruler" on the sides, which is stupid and useless. It would be better to have a flat surface in my opinion, but nothing can be removed by quick sanding.