... 8.5, 9, 9.5, 10. HSS straight shank twist drill1.Material:HSS M42,M35,6542(M2),9341, ... series) DIN 340 (long series) DIN 1897 (stub series)5.Diameter:1mm-20mm6.Flatted shank prevents slippage in three ... of twist drills,such as HSS straight shank twist drills,taper shank drill,SDS drill bits,center drills,step ... drill,flat wood bit,Hss reduced shank twist drills,hss hex shank twist drills and so on,but ...