... a certaindegree of accuracy in machine tools. Semi-finishing and finishing the holes, Also used for the preworking ... is following. coatingTIN, TIALN, ALTIN, TIAIN, etc.sizesstandard and non-standard.materialsolid carbide,hss,hss-coworkpiecwood,plywood,steel,aluminum,plastic ... etctool lifeLonger tool life, super high wear resistant and impact-resistant application.hardnessGood for machining up to HRC65 ...