Hubby is working on repairing a wheelchair ramp for my grandmother, and it's not 90 degrees. He was struggling to cut the boards at an angle when this bad boy showed up in the nick of time! He was super happy for the help! Not that it's a problem, but the thickness of this was surprising. I was thinking it would be more like a school ruler, but it's twice as thick. It's plastic, but it should last as it's just a measuring tool. At this price, overall very happy!