1.Material:HSS4241, HSS4341,HSS9341, M2, M35 2.roll forged,edge ground,fully ground 3.High quality dia. working length overall length 1.012341.518402.024492.530573.033613.236653.539704.043754.243754.547804.852865.052865.557936.057936.5631017.0691097.5691098.0751178.5751179.0811259.58112510.08713310.58713311.09414211.59414212.010115112.510115113.0101151 HSS twist drill set-20pcs set