Cobalt Drill Bit 3/8" Twist Drill Bits, M35 High Speed Steel, Pack Of 5 Pcs ?3/8" Cobalt Drill Bits?5pcs - 3/8" (Dia 9.26mm) x3-5/8" (Flute Length 92.08 mm) Metal Drill Bits. This Drill Bit fits the majority of power drill currently on the market and come with a Index Storage Case for easy storage and organization. ?M35 Cobalt Drill Bit?Industry grade M35 high speed steel drill bit set, much harder than HSS used in other similar drill bits set. These drill bits contain 5% Cobalt, The drill bits are hardened and polished for improved sharpness and precise cutting without wobbling, wear-resistance and durability. This improves work efficiency. ?135 Split Point Fully Ground Process?135 split point with straight shank prevents walking and makes drilling precise and faster. No center punch positioning guide is required. Fully ground spiral groove design clears particles quickly, decreases friction and heat for a more efficient drilling performance. ?Multiple Application?Suitable for cutting through Hard Metal such as Stainless Steel, hardened steel, Steel, Sheet Metal and Cast Iron as well as Plastic, Aluminum Alloy, Wood and Other Softer Metals. Pay attention to speed, pressure and heat control during drilling.(Note: Hardened steel needs to be below HRC38) ?Quality commitment?If you are not fully satisfied for any reason, Please contact us for 100% refund or replacement. Have any questions, Please feel free to contact us and we will be happy to assist you.