... for business talks.About products1. Integral drill steels (Integral Drill Rods)Shank H22x108mm, H19x108mm, standard hex. Bit diameters include 20-42mm.2. ... U76, U82, U84, U85, U92, U94, U95, U118 and coal bolting bit and coal bolting rod.6. All kinds of casing bits for ... 33mm, 38mm, etc.8. Blast furnace tap hole drill tools. (Rod, Cross bits, button bits and X-type bits etc). PDC coal mining tools