Hyjoy Cobalt Drill Bit 5/16" Drill Bits, M35 Speed Steel Jobber Length Drill Bit, 135 Degree Tip for Hard Metal, Steel, Cast Iron with Index Storage

【5/16" Cobalt Drill Bits】10pcs 5/16" (Diameter 8mm) 3" (Flute Length 76.2mm) Metal Drill Bits. These drill bits are with most drills the market and include Index Storage Case for convenient storage and organization. 【M35 Cobalt Drill Bit】Industrial grade M35 -speed steel drill bit set, significantly harder than HSS in other comparable drill bit sets. These drill bits include 5% Cobalt, The drill bits are hardened and polished for sharpness and without wobbling, wear-resistance and longevity. This enhances work productivity. 【135° Split Point Fully Ground Process】135° split point with straight shank prevents wandering and enables precise and faster . No center guide is needed. Fully ground spiral design clears chips quickly, reduces friction, and allows for more efficient . 【Multiple Application】Suitable for through Hard Metal such as Steel, hardened steel, Steel, Sheet Metal and Cast Iron as as Plastic, Aluminum Alloy, Wood and Other Softer Metals. Pay attention to speed, pressure and control during use.(Note: Hardened steel needs hardness below HRC38°) 【Satisfaction Commitment】If you are not fully satisfied for any reason, contact us for 100% refund or . Have any questions? free to contact us, and we will be happy to assist you.