... , 8, 8.5, 9, 9.5, 10. HSS straight shank twist drill1.Material:HSS M42,M35,6542(M2),9341,4341 ... kinds of twist drills,such as HSS straight shank twist drills,taper shank drill,SDS drill bits,center drills,step drills,masonry drill,,wood ... working drill,flat wood bit,Hss reduced shank twist drills ...