Description6pcs M3-M10 Screw Tap Drill Bits Hss Taps Countersink Deburr Set Metric Combination Bit High Speed Steel Bright Finish 1/4 IN Quick Change HexSpecifications:Name: Hexagon handle compound Tap Drill BitsMetric : M3x0.5, M4x0.7, M5x0.8, M6x1, M8x1.25, M10x1.5Material: High-speed steel(HSS )Suitable for soft metal, aluminum, ironSize:M3x0.5: Total length: 55mm, Spiral length: 24mm, drill diameter: 2.5mmM4x0.7: Total length: 54mm, Spiral length: 24mm, drill diameter: 3.3mmM5x0.8: Total length: 58mm, Spiral length: 28mm, drill diameter: 4.2mmM6x1: Total length: 58mm, Spiral length: 28mm, drill diameter: 5.0mmM8x1.25: Total length: 59mm, Spiral length: 18mm, drill diameter: 6.8mmM10x1.5: Total length: 59mm, Spiral length: 20mm, drill diameter:8.5mmSquare handle: 6.35mm(1/4")Notice:Manual measurement may be a little error please understand!