... Material:45#carbon steel high quality,great variety of goods size:7-9,8-10,11-12(13-14),15-17,19 ... alloy plated3. Torque: meeting the ANSI standard,Quanlity can reach the GB,DIN & ANSI standard4. Size: 7-9,8-10,11-12(13 ... -14),15-17,19-21(1/4-5/16, 3/8-7/16,1 ...