100Pcs Drillforce Tools M35 Cobalt Drill Bit Set Hss-Co Drill Set 1-3mm for Drilling on Hardened Steel

Color: gold Material: Cobalt steel alloy Cobalt drill bits are not made of pure cobalt rather a steel alloy with certain percent cobalt. The 5-percent alloy is known as M35 grade. The cobalt increases the strength of the steel and makes it more heat-resistant. For Drilling Stainless Steel This M35 cobalt steel drill bits are particularly successful in cutting through hard metals such as stainless steel and cast iron although they can be used for softer materials too. 135 Degree Split Point The flater the drill the smaller the chip width. This means less force required to remove metal compared with lower angles like 90° and 118°. This is important on hard stuff because your power requirements are already more than mild steel so making the chip load less helps. It also reduces heat since less surface area is generating the cut. Not Suggested for Hardened Steel High Carbon Steel and Steels Blended with Impurities Cooling Liquid Required use with cooling liquid to prolong the working life of the drill bits and to avoid overheating and breakage. About Breakage be careful when you drill holes with shese needle-like small bits. They re more likely to than larger ones. Package Includes : 20PC X 1.0MM drill 20PC X 1.5MM drill 20PC X 2.0MM drill 20PC X 2.5MM drill 20PC X 3.0MMdrill Only the above package content other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.