Deep Hole Long Precision Twist Drill Bits Fully Ground Variable Helix Angle

High Hardness High Precision Solid Carbide 2 Flute Deep Hole long Twist Drill Bit-20D 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, taitanium alloy, tool steel, and heat-treated steel Products Feature Special designed drill tip: Special designed drill tip will increase the Centering