The Makita round Shank Titanium Nitride Bits are designed for use drilling holes with impact drivers or driver-drills. These bits feature a 135° split point for faster more accurate starts in a variety of material. Each bit is made from high speed steel and coated with titanium nitritde for added durability and a long life - Titanium Nitride (TiN) coating offers the lowest possible level of friction and minimal wear - High Speed Steel (HSS) construction for added durability and long life - The tip is 135°Split point leading to anti-slip when drill on curve surface - For drilling holes in ferrous metal, wood, plastic, non-ferrous metal, cast iron and stainless steel