Hss twist drills Manufacturing process:roll forged or fully ground Material: f4341, 4341, 9341, m2, m7, m35, m42, w9mo3cr4v, w4mo3cr4v Point angle: 118degree or 118/ 135 degree (split point) Finish: bright, black oxide, black & gold, polished, coffee, ti-coated Diameter: 0.2-100mm Shank: straight shank, taper shank, hex shank, reduced shank Flute: n or va (parabolic) Suitable for cast iron, carbon steel, alloy steel, stainless steel, non-ferrous metals under 32 hrc. Standard: din338, din1897, din340, din1869, din341, din345, din1870, ansi