Tlily - 50PCS Drillforce Tools M35 Cobalt Drill Bit Set,HSS-CO Drill Set 1-3MM,for Drilling on Hardened Steel, Cast Iron&Stainless Steel X2 I249854

M35 Cobalt Steel - Made from M35 cobalt steel, with added molybdenum and cobalt, creates a hardened alloy, measuring up to 67 hardness, for significantly deeper cutting and extended life, up to twelve times better than an average drill bit. No center punching required - 135° cutting points are self-centering and penetrate quickly with less pressure. No "walking" or "wandering" For Stainless Steel - Particularly effective for cutting hard metals such as stainless steel and cast iron, although can also be used for softer materials. Not for hardened steel / high carbon steel. Try adjusting the RPM when it doesn't penetrate. 50pcs Set - The set includes 50pcs M35 cobalt steel metric twist drill bits: 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 10pcs of each size. cobalt Cobalt drill bits are not made of pure cobalt, but a steel alloy containing a certain percentage of cobalt. The 5% alloy is called M35 grade. Cobalt increases the strength of steel and makes it more heat resistant. Color: Gold Material: