... tungsten carbide drill bits 1)Bright Finished, Black Oxide, TiN Coated 2)Material:carbide,HSS,HSS-CO high quality tungsten carbide ... & milling tools: CarbideEnd Mill, Ball & Nose End Mill, Corner Radius End Mill, Roughing End Mill, Drill Bits,Twist Drill, Center Drill, ... hardness and precision, extreme smooth coating surface, can be coated by TIN,TIALN, ALTIN, TIAIN, etc.5) Excellent performance in ...