... , HSS tool bits, PCD diamond insert, gear hob,....Carbide Fixed-point Drill Bits 1, Suitable for Mould steel, Cast iron, Aluminum ... alloy, Copper, and Alloy steel processing. 2, Mainly for fixing point and chamfering before drilling the hole for the workpieces. We ... ×16×100L881610010D×10×20×100L10102010012D×12×20×100L121220100 Carbide Fixed-point Drill Bits