HSS(High-Speed Steel) enables the drill body to harder and can keep a longer drilling life and fast drilling performance. 200mm length 6 pcs at Harfington, get more straight shank drill bits in various size. Uxcell High Speed Steel Extended Twist Drill Bits 5mm Drill Dia... ★ Wide Applications --- The high-speed steel drill bits can be used with various power tools such as electric drills, hand drills and impact drills, and are suitable for a variety of materials, including stainless steel, aluminum alloys, iron, copper, brass and other metal materials. Suitable for Stainless steel, iron, copper, aluminum alloys, wood, plastic drilling and carving.. [Twisted Design]- Spiral flute design for quick cleaning of chips. CoCud Reduced Shank Drill Bit, 27mm Cutting Edge 1/2 Shank, Nitride... --- The spiral flute design enables efficient chip removal during drilling, reducing clogging and heat build-up. Rolex GMT Master reference 6542 u2013 the earliest and rarest of all GMT models continues to be one of the ultimate prizes for many Rolex sports watch collectors ★ Spiral Flute Design --- The spiral flute design enables efficient chip removal during drilling, reducing clogging and heat build-up. Useful Tips:--- Please keep cool and gentle use, the correct use can greatly extend the life of the twist drill. Buy 10pcs high-speed steel drill bits 6mmx80mm for hole saws arbor drill bit replacement thick metal cutting at , get more straight shank drill bits in various size ★ Useful Tips --- Please keep cool and gentle using, the working life of the twist drill bits can be largely prolonged by proper usage.