Set of 6 long threaded drill bits, metric M3 to M10 Designed for drilling and tapping soft metals, aluminum sheet, plastic, copper, steel, wood, etc. Combination drill bits for metal. Drilling and tapping with one tool. HSS high-speed steel drill bits. Bit-type hex shank, 1/4 (6.35 mm) for screwdrivers. IMPORTANT: Combination drill bits are recommended to be used at slow speeds, it is recommended to use coolant during operation. Set includes: M3 x 0.5mm - 64mm M4 x 0.7mm - 64mm M5 x 0.8mm - 67mm M6 x 1.0mm - 67mm M8 x 1.25mm - 70mm M10 x 1.5mm - 70mm