... manufactured with a middle stop to prevent walking along the thread. Include couplings sleeve (threaded R22, R25, ... .4. DTH hammers and DTH bits (Down The Hole Drilling)Offer IR hammer, DHD3.5, DHD340a, DHD360, DHD380, ... with flat face, concave design fit for the atlas copco and ingersoll-rand model etc.5 ... 30mm, 33mm, 38mm, etc.8. Blast furnace tap hole drill tools. (Rod, Cross bits, button bits ...