MEMKEY 3PCS Countersink Drill Bit, Triangular Tapered Titanium Countersink Drill Bit, 4-12/20/32mm, hss Stainless Steel Metal, for Screwdriver Drilling on

【High-quality material】 Conical step drill and titanium. Twist drill made of high speed steel with titanium coating to reduce friction and heat, more powerful and durable. The M35 cobalt drill bit set has high hardness. 【Dimensions】 3-piece step drill set, which includes three different sizes of 4-12mm/4-20mm/4-32mm to meet different drilling size requirements. 【 Non-slip design】 The titanium step drill bit set features a groove design that gives the electric drill a better grip and prevents slipping or falling when rotating. 【 Efficient operation】 During the drilling process, the titanium step drill vibrates less than twist drills and has a clear scale, a wide and flexible application for easier work. 【multifunction】Titanium hex drill bits are perfect for cutting holes in a wide range of materials including brass, wood, plastic and over 25 hardness grades. Easily cuts 1-5mm thick iron, aluminum, wood, plastic, carbon steel, durable.