4" Machinist Square EXL60020

• Square used for accurate measuring in inches and metric.
• These squares are perfect for 90° layout and machine set-up. These squares are made from hardened, tempered and polished carbon steel.

A machinist square, also known as an engineer's square, is a measuring tool used in the field of metalworking and mechanical engineering. Used by machinists, engineers and metalworkers in several industries. 

Uses include checking the perpendicularity of surfaces, setting up and aligning machine tools, checking the accuracy of workpieces during machining, and marking or scribing lines at a precise right angle.