... T45, T51 ; bit diameter: 45mm-127mm);Couplings sleeves- manufactured with a middle stop to prevent walking along the thread. Include ... , R28, R32, R38, T38, T45, T51)Shank adapters - carburized and manufactured with tight tolerances and controlled straightness.4. DTH hammers ... 38mm, etc.8. Blast furnace tap hole drill tools. (Rod, Cross bits, button bits and X-type bits etc). Round Shank Cutter Bits