... " DTH hammer with the similar quality level to Atlas and Sanvik. Factory price and Carbide material. BETOPPER DTH bits are in ... used in earthwork projects, minerals exploitingss, well-digging projects and foundation constructions etc.In 3" series, parameter about different ... request, pls refer to below chart: COP34,HD35,IR3.5Bit Dia.NO.AirGaugeFrontWeight(mm ...