1pc 500mm Length Cobalt Drill Bit, Diameter 5-14mm M35 HSS Metal Twist Drill Bits Straight Shank For Stainless Steel Cast Iron(5mm)

Diameter: 5mm , 6mm , 7mm , 7.5mm , 8mm , 8.5mm , 9mm , 9.5mm , 10mm , 10.5mm , 11mm , 11.5mm , 12mm , 12.5mm , 13mm , 13.5mm , 14mm Made of high speed steel (HSS) with excellent abrasion and impact resistance, it is able to cope with the drilling needs of metals and other hard materials while maintaining stable performance over long periods of time, reducing chipping, wear and tear, and other problems. A special alloy system is formed by adding 5% cobalt to the high-speed steel. The addition of cobalt significantly improves the material's ability to maintain high-temperature hardness, even in high-temperature cutting environments, the hardness can still be maintained at HRC 60 or above, far more than ordinary high-speed steel drills. Classic twist structure, high efficient cutting performance drill body is spiral, its spiral groove design can effectively chip removal, to avoid the accumulation of debris affecting the drilling efficiency and precision, can quickly cut into the material, reduce cutting resistance, reduce heat generation, suitable for high-speed rotary drilling operations, improve machining efficiency. It is suitable for drilling metal (such as steel, iron, aluminium, copper), plastic, wood and other materials, widely used in machining, automotive repair, furniture manufacturing, DIY crafts and other fields.