HSS DIN 1897 pilot drill bits extra short -right hand cutting,type N -material:M2,9341,4341 HSS -high-performance high-speed HSS DIN 1897 pilot drill bits extra short -High speed steel For use in:In thin sheets,steel and cast steel,alloyed and unalloyed,up to a strength of 800N/mm2,cast iron,malleable iron,ductile iron short chipping aluminiu malloys,bronze,tough brass,gunmetal,pressure castings, ...