drill bit material:hign speed steel for drilling in steel,cast steel,malleable iron,sintered metal,non-ferrous metal. drill bitmaterialhss(M35,M42,F4341,9341 or 4341)surface finishedblack oxide,tin coated,erbor fiished,white finishedmanufacturing processroll forged,fully ground,edge ground 1.Manufactured to DIN3382.Fully ground from solid material3.135°split point4.Dimensional precise.