• Set Includes: 3, 4, 5 & 6mm • Designed to make an indentation in metal, plastic or wood prior to drilling to prevent the bit skating off target • 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 punch in position and strike firmly with hammer or mallet