Pin punches: 2, 3, 4, 5, 6, 8 & 10mm. Cold chisels: 12, 20 & 24mm. Designed to drive out pins and rivets and cutting and scoring steel. Chrome Molybdenum (Cr-Mo) alloy steel for strength & durability. Single piece construction. Hexagonal shank for additional durability. Heat tempered to prevent the head from shattering or chipping during striking. Easy to use, just place chisel in position and strike firmly with hammer.