4" Machinist Square

Constructed from hardened carbon steel, with high tolerance and ground surface and edges, this 90° engineer/machinist square is ideal for design work. This tool helps with making perfect 90° right angles. German DIN Standard 875 Grade 1. Square Dimensions: 4" (100 mm). Base Thickness: 15/32" (11.86 mm). Square Tolerance: 0.0002". Straightness Tolerance: 0.0005".