... are a professional manufacture of rock drilling tools, mining tools, DTH Drilling tools. construction tools and excavating coal pick cutter tools ... ,DHD380,and low pressure hammers CIR65a, CIR90, CIR110, CIR150,CIR170etc,DTH drill bits:60mm-254mm bits with flat face, concave design ... tools.7.Round road planing bit for road milling machine and trenching machine. Shank dia:19.4mm,25mm,30mm,33mm,38mm,etc ...