STEPPER DRILL BIT SHEET METAL DRILLING PUNCH SET Product Features 3 Piece stepped drill bit set made of High Speed Steel. Cutting without cracking with double flute system. Small Drill: 4, 6, 8, 10, 12 mm Medium Drill: 4, 6, 8, 10, 12, 14, 16, 18, 20 mm Large Drill: 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32 mm Tin coating 6 times more durable than normal HSS bits. Package Contents 1 piece stepped drill bit sheet metal drilling punch set