YongCo Speed Steel Twists Drill Set Straight Shank, Fully Ground for Hardened Metals and Stainless Steel

With its speed steel construction, the professional twists drill set is for drilling through stainless steel and other metals. Precise grinding process with smooth surfaces and high grinding accuracy; 135° SPLIT Point drill bit, and cut , stable feed; Suitable for hand electric drill, electric drill, drilling machine, machining center, milling machine; Note: It can not use on tiles, concrete, wall, stones, ;