As a practicing professional mechanical engineer, I'm use to handling more robust adjustable set squares. However, for the price, this item is very good value and delivers good performance. It is clear, nicely bevelled and accurate. The settings are retained firmly and positively with no slack in the pivots. Well recommended.
A useful tool for technical drawing. Sturdy construction with positive locking. My only reservation is that the markings are already wearing thin after relatively little use. This won't affect overall use, but at this price is nevertheless a little annoying.