... tools,drill bit,drill bits,rock drilling tools 1. Button bits: Tapered button bits (28mm, 30mm 32mm, 34mm, 36mm, 40mm, 42mm, 44mm ... : R22, R25, R28, R32, R38, T38, T45, T51 etc.) Retrac Button bits with different Thread different diameters. 2. Dth bits: From ... designed according to customers reqeusts. 6. Intergral Drill steelShank h22x108mm, Tips as 22mm, 24mm, 26mm, 28mm, 30mm, 32mm, 34mm, Length can ...