... Specifications.U92coal mining wear parts/tungsten carbide mining bits/coal pick bits .42CrMo .sleeve holder retainer .long ... bit, retainer, holder/block, sleeveusagemining, trenching used in coal mines, iron ores, aluminum ores and geotechnical engineering, as ... as basement tunneling and road constructionmarketBrazil, Australia, Chile, Canada, USA, South Aisa,Japan, Russia, France, German, Poland, ...