... used primarily for milling t slot in machines table.3.materials can be high speed steel,hss, hss co, solid carbide ... , ALTIN, TIAIN, etc.sizesstandard and non-standard.materialsolid carbide,hss,hss-coworkpiecwood,plywood,steel,aluminum,plastic,glass,stone etctool ... -resistant application.hardnessGood for machining up to HRC65 degree T sot milling cutter made from HSS or tungsten carbide for aluminium