HSS drill: 1.High hardness 2.High temperature resistant. 3.Materials:4341 9341 6542 M2 M35 M42; 4.Fully ground HSS DRILL1.Materials(HSS):4341 9341 6542 M2 M35 M422.Tchincs: fuly fround, half ground, roll forged, milled3.Surface treatment: Black oxide, bright, amber, yellow. white-black.4.Packing: Pvc+ white paper box + exmport carton & others as per your request.5.Quality:High hardness6. ...