high quality tungsten carbide drill bits 1)Bright Finished, Black Oxide, TiN Coated 2)Material:carbide,HSS,HSS-CO high quality tungsten carbide drill bits1)Bright Finished, Black Oxide, TiN Coated2)Material:carbide,HSS,HSS-CO3) Our factory specialize in manufacturing all types of cutting & milling tools: CarbideEnd Mill, Ball & Nose End Mill, Corner Radius End Mill, Roughing End Mill, Drill Bits, ...