You may also like. 10PCS 31/64 Cobalt Drill Bit Set M35 HSS Jobber Length Twist Drill Bits Tools. Drill Steel, Stainless Steel, metal. HSS Cobalt, Co5% HSS, M35. 31/64 Cobalt Twist Drill Bits. Jobber length twist spiral drill bits. N-shaped 135-degree point angle. Double edge, cylinder bit body & right rotation. Fully Ground processing technology for bright, smooth surface and durability. Long life, wear resistant & precise dimensions. Marterial: HSSCO High speed M35 cobalt steel. For use in Iron, Aluminum, Carbon steel, 304 stainless steel, Plastic. Manufactured from M35 cobalt steel, with molybdenum and cobalt added to creates a hardened alloy, measuring Rockwell hardness up to 67, for much faster cutting and extra longer life span, with up to twelve times when compared with an average HSS drill bit. No center punch is needed-the 135° Quick-Cut points are self-centering and penetrate quickly with less pressure. Will not “walk” or “wander”. Extremely heat resistant; must be used and operated at 1500 RPM or greater for maximum efficiency. Straight round shank allows for firmly holding and accurate centering, fit for standard drill chucks and regular round collet chucks. The set includes 10pcs of M35 cobalt steel twist drill bits: 31/64 inch. Particularly successful in cutting through hard metals such as stainless steel and cast iron, although they can be used for softer materials, too. (2) Please open the parcel when the presence of the postal staff. If the parcel damaged or empty(stolen), please ask the post office to provide official document, especially the claim request paper.