Assorted Basic Twist Drill Bit Set Tungsten Solid Carbide Material For Metal Drilling

High Hardness Tungsten Solid Carbide Twist Drill Bits-50D With Best Metal Products Function: 1. HRC: HRC45 HRC55 HRC58 HRC60 HRC65 2. Coated: AlTiN, TiAlN, TiAISI,TiSiN, TiN, DLC, Nano, Diamond 3. Could be used for the processing of plastic,wood, Aluminium.copper, cast iron, carbon steel, mould steel, stainless steel, titanium alloy, tool steel, and heat-treated steel Products Features: 1. Special Designed Drill Tip: Special designed drill tip will increase the Centering