DTH Hammer & Bits 1.Certificate: ISO9001:2000 2.Cemented carbide buttons 3.Three ... with DTH bit and drill pipeDTH Hammer and Button bits Size available:DTH bits from 85mm to 330mm.The main products are ... or equal DHD, COP and SD series hammers,Our DTH bits range include85mm, 90mm, 95mm,100mm, 105mm, 110mm, 115mm 120mm, 127mm ...