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Metal drill bits ground from solid, extremely heat resistant 5% cobalt-alloyed high speed steel produced according to DIN 338. Suitable for drilling high alloy content steels and metals with tensile strengths over 1000 N/mm≤ like stainless steel. QUAD EDGE Tip: unique combination of 135∞ split point and four cutting edges: 135∞ split point allows for precise & fast drilling start without walking. Four cutting edges create smaller chips to prevent heat build up for longer life. Variable flute geometry: For faster material ejection. Helps the bit run cooler and prevent it from burning out faster. Enhanced tapered web: Wider core towards the shank of the drill bit. Strengthens the core to increase overall flute durability. 3-flat shank from ? 5 mm for better grip and prevents chuck slippage. Colour: bronze.