Trepot 5PCS HSS Titanium Step Drill Bit Set and Automatic Center Punch High Speed Steel Drill Bits Double Cutting Blades Design 50 Sizes with Aluminum Case Short Length Drill Bits Set

Titanium Step Drill Bit is made of high speed steel together will titanium coating , which lasts the bit a long using life. Features 1. Laser marking makes the size more clear; 2. High speed steel for longer service life; 3. 3-sided shank prevents slip in drill chuck; 4. Double cutting blades design enables a faster and smoother cutting; 5. X-type openings design to facilitate the removal of cutting waste when drilling; 6. Cobalt added reduces friction and lasts longer than those which does not contain cobalt bits; 7. The sharpness and titanium coating ensure easily cut through most sheet metal, plastic and some other materials with ease. Note Check the concentricity of the spindle and spring chuck and the clamping force of spring chuck, for the concentricity may cause the drill bit broken and make drill hole too large.