Drill Bit, End Mill, Step Drill manufacturer / supplier in China, offering 90° 3-Flute HSS Chamfer Drill Bit with Nano Blue Coating (6.3– 20.5mm), HSS Tin-Coated 90° Chamfer Drill Bit – Countersink & Deburring Tool, Tin Coated HSS 90° Countersink Chamfering Cutter and so on.