4 Flute Spiral Quick Release Step Drill4-12mm Drills & deburrs in one processIdeal for: Non-ferrous metals, sheet steel, plastic & stainless steel up to 3mm thickSuits: Non-hammer action portable power drills Self-starting split point removes the need for a pilot hole 4 flute spiral design cuts faster with less vibration for fast, clean & accurate holes TiN coating reduces heat & increases lubricity for extended life Laser etched hole Premium HSS M2 raw material for extended life Non-slip 1/4 inch quick change shank Hangable 1 piece plastic card Technical information: Number of steps: 9 steps Step sizes: 4, 5, 6, 7, 8, 9, 10, 11 & 12mm 1/4 inch shank