4R Grad: 8ths, 16ths, Quick Reading 32nds, 64ths * Smooth Black Enamel Finish * Satin Chrome Blade * Forged and Hardened Steel Head * With reversible lock bolt, scriber, spirit level * Bearing surface is accurately ground * Graduation: No. 16R - quick reading 1/32", 1/64", aircraft quick reading 1/50", 1/100" * Square blade easy-to-read, sharp graduation * The square head are forged hardened steel with smooth black enamel finish