The Bosch 2608577139 is suitable for use on alloyed and non-alloyed steel, cast steel, cast iron, sintered iron, non-ferrous metals, sheet metals & plastics The extremely strong body provides extreme robustness. These drill bits are precision ground from solid metal with an oxide coated flute for slicing through materials with reduced wear. Active cutting and perfect centering due to pointed split point tip. 1/4\" hex shank for universal use with drill drivers, impact drivers and drill stands. Features: Extremely strong body provides extreme robustness Suitable for use on alloyed and non-alloyed steel, cast steel, cast iron, sintered iron, non-ferrous metals, sheet metals & plastics Manufactured to DIN 338 Specification: Shank Size: 1/4\" Accessory Fitting Style: Hex Bit Type: Metal (HSS) Product Material: HSS (High Speed Steel) Pack Size: Pack of 8