... (stub series)5.Diameter:1mm-20mm6.Flatted shank prevents slippage in three jaw chuck 7.point angle:118 degree,135 degree split ... all 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 ...