Review on Positioning Woodworking Right Angle Right Angle Carpenter by Reed Nuttbrock

These mounting brackets are of course designed for use with clamps; in themselves they are not brackets. So use your clamp of choice to press a board against each leg of one of these squares and these boards will meet at a 90° angle. Mostly. In fact, all of these squares are slightly offset; some more than 90° and some less. And the legs aren't quite straight. But the flaw is barely visible to the naked eye, and these are designed for woodworking, not high-precision metalworking. I expect them to be good enough for my purposes and for many (but not all!) other carpenters.