Stanley 4-18-226 Punch Kit (6 Piece) The Stanley 4-18-226is a 6-Piece Punch Set made from chrome vanadium steel for increased strength, durability and reduced breakage. It is a great engineering kit for marking centre lines, hole locations and pilot drill starting points. Features: Increased strength and durability for retained accuracy One-piece construction forged from tempered tool steel for strength Powder coat finish for increased visibility Quality chrome vanadium steel Quenched & tempered to precise specifications Specification: Part number: 4-18-226 Number of pieces: 6 Sizes in mm: 1.5, 3, 4, 5, 6, 8mm Sizes in inches: 1/16, 1/8, 5/32, 3/16, 1/4, 5/16in