Starrett C11H-12-4R 12 combination square with square head and 12” satin chrome blade the Starrett 12" combination square with square head includes a reversible lock bolt, scriber, spirit level, and hardened steel, photo-engraved blade with satin chrome finish. The combination square includes a cast iron head with black wrinkle finish. 12”, 4R grad, satin chrome blade. Graduation Type 4R, graduations 8ths, 16ths, quick reading 32nds, 64ths, head finish black wrinkle, head material cast iron, head Type square head only, base Length 4-9/16", number of pieces 2.