... , 7.5, 8, 8.5, 9, 9.5, 10. HSS straight shank twist drill1.Material:HSS M42,M35,6542(M2),9341,4341 ... -20mm6.Flatted shank prevents slippage in three jaw chuck 7.point angle:118 degree,135 degree split point8.Advanced equipment and technology9.certification ... provide all kinds of twist drills,such as HSS straight shank twist drills,taper shank drill,SDS drill bits,center drills,step drills ...