... tool,Button bits,rock drill,threaded,tapered,drilling tools, 1. Button bits: Tapered button bits (28mm, 30mm 32mm, 34mm, 36mm, 40mm ... DHD380 Cop34, Cop44, Cop54, MACH30, MACH40, MACH50, MACH60 etc4 Tapered Drill RodShank h22x108mm, (6, 7, 11, 12 degree taper) , Length ... to customers reqeusts. 6. Intergral Drill steelShank h22x108mm, Tips as 22mm, 24mm, 26mm, 28mm, 30mm, 32mm, 34mm, Length can be ...