drill bit,drill bits,rock drilling tools,rock drilling tool,Button bits,rock drill,threaded,tapered,drilling tools, 1. ... Cop44, Cop54, MACH30, MACH40, MACH50, MACH60 etc4 Tapered Drill RodShank h22x108mm, (6, 7, 11, 12 degree taper) ... be designed according to customers reqeusts. 6. Intergral Drill steelShank h22x108mm, Tips as 22mm, 24mm, 26mm, ... tolerances and controlled straightness. Drill bit