... Bit diameters include 20-42mm.2.Tapered drilling tools(Tapered Drill Steel)Including:Drill rods with Shank H22x108mm,(6,7, ... hammers CIR65a, CIR90, CIR110, CIR150,CIR170etc,DTH drill bits:60mm-254mm bits with flat face, concave ... U118 And coal bolting bit and coal bolting rod.6.All kinds of casing bits for shield ... 33mm,38mm,etc.8.Blast furnace tap hole drill tools.(Rod, Cross type bits, button bits and X ...