Dth Hammers: High Pressure DTH Hammers and Low Pressure DTH hammers Equipped together with dual concentric drill pipe, air-driven hollow down-the-hole hammer can perform continuous reverse circulation core (sample) drilling and other drilling technology. It is suitable for geological exploration core drilling, well drilling, engineering drilling in hard or complicated formations and it has advantages of high drilling efficiency, long life of bit, high quality of drilling hole and core. Hammers Type Includes: DHD340, DHD350, DHD360, DHD380 Cop34, Cop44, Cop54, MACH30, MACH40, MACH50, MACH60 etc Dth bits: From 115mm, 120mm, to 165mm, 178mm and 270mm and 310mm, The shank can be designed according to different hammer, for example: DHD Hammers series (DHD340, DHD350, DHD360, DHD380 ets. ) , Cop Hammers series (Cop34, Cop44, Cop54 etc.) , HD hammer series, Mach hammer series (MACH30, MACH40, MACH50, MACH60 etc) , Surface can be Flat and convex and others according to different Rock, what's more, we can make them according to customers reqeusts.