These specialist punches are manufactured from Chrome Vanadium Steel, hardened and tempered to 45HRC and chemically blacked. The punch has a shaped end for positive location and an undersized body to prevent jamming. The punches are suitable for metric or imperial pins. contents: 3.0(1/8"), 4.0 (5/32"), 5.0 (3/16"), 8.0 (1/4") and 9.5mm (3/8")