NO CENTER AWL NEEDED - 135° fast cut points automatically center and penetrate quickly with less pressure. Will not "walk" or "wander" M35 Cobalt Steel - Manufactured from M35 cobalt steel, with molybdenum and cobalt added to create a hardened alloy, which measures hardness up to 67, for much faster cutting and longer life, with up to twelve times compared to an average bit HSS drill. 50 PIECES SET - The set includes 50 pieces of M35 cobalt steel metric twist drill bits: 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 10pcs of each size. For stainless steel: particularly in the cutting of hard metals such as stainless steel and cast iron, although they can also be used for softer materials. Not for hardened steel / high carbon steel. Try adjusting the RPM when you can't penetrate. Cobalt drill bits are not made of pure cobalt, from a steel alloy with cobalt percentage. The 5 percent alloy is known as M35. Cobalt increases the strength of the steel and makes it more resistant to ., Weight: 0.1433004703 pounds, Manufacturer: Rtxbvg