Highly accurate, made of the finest quality steel, hardened and tempered, with satin-chrome finish. Graduations: 3R – 32nds, 64ths, 10ths, 50ths 4R – 8ths, 16ths, 32nds, 64ths 5R – 32nds, 64ths, 10ths, 100ths 16R – 32nds, 64ths, 50ths, 100ths E/M – 32nds, 64ths, mm, 0.5 m M – mm, 0.5 mm, mm, 0.5mm