Detailed Product Description Material: HSS4241,4341,9341,M2,M35Diameter:2.0MM-6.0MMSurface Colour:BLACK (Nitriding),BrightManufacturing Process: Roll Forged,Edge Ground and Fully Ground We can offer drills of different kinds and specifications as your requested.And the product feature is toughness and abrasion resistance and perfect cutting ability.It is suitable for cast iron,cast steel,carbon ...