1.Diamond bits 2.Long working life 3.ISO9001 ... and excavating coal pick cutter tools.1. Integral drill steels (Integral Drill Rods)Shank H22x108mm, H19x108mm, standard hex, Bit ... 20-42mm.2. Tapered drilling tools (Tapered Drill Steel)Including:Drill rods with Shank H22x108mm,(6,7,11,12 ... pressure hammers CIR65a, CIR90, CIR110, CIR150,CIR170etc,DTH drill bits:60mm-254mm bits with flat face, concave design ...