... most lengths.A comprehensive range of button bits, cross bits and chisel bits with (6, 7, 11, 12 ... and controlled straightness.4. DTH hammers and DTH bits (Down The Hole Drilling)Offer IR hammer, DHD3 ... CIR90, CIR110, CIR150, CIR170 etc. DTH bits: 60mm-254mm bits with flat face, concave design fit for the ... kinds of round cutter bit and flat cutter bits for excavate coal machine as the replacements of ...