HSS DIN 1897 pilot drill bits extra short -right hand cutting,type N -material ... performance high-speed HSS DIN 1897 pilot drill bits extra short -High speed steel For use in:In ... /mm2,cast iron,malleable iron,ductile iron short chipping aluminiu malloys,bronze,tough brass,gunmetal, ... castings,biecastings.Application:In all rotary and percussion drill machinesIn machining equipmentOnly for rotary use HSS ...