Drill Bit, End Mill, Step Drill manufacturer / supplier in China, offering 3– 20 & 15– 35 Deburring External Chamfer Tool 2PCS Set, 3– 20 & 15– 35 Deburring External Chamfer Tool 2PCS Set (Black Oxide), Remove Burr Deburring Countersink External Chamfer 1/8"-3/4" and so on.