... usage: Milling fitting holes with a certaindegree of accuracy in machine tools. Semi-finishing and finishing the holes, Also ... , ALTIN, TIAIN, etc.sizesstandard and non-standard.materialsolid carbide,hss,hss-coworkpiecwood,plywood,steel,aluminum,plastic,glass,stone etctool lifeLonger ... to HRC65 degree carbide step reamer drilling and milling reamer and tapered hand reamer with spiral / straight flute