... ,Edge ground,Fully ground,Milled4. Point angle: 118degree,135 degree split point5. Surface finished: Bright finished,black oxide,tin oxide,black ... flute&bright shank,rainbow etc.6. Shank: Straight shank drills, Taper shank drills, 1/2 shank drills,Wood working drill bits ... iron3.sintered metal4.non-ferrous metals5. wood and so on taper drill