... S120 S150 S170... bit, retainer, holder/block, sleeveusagemining, trenching used in coal mines, iron ores, aluminum ores and geotechnical engineering, as ... well as basement tunneling and road constructionmarketBrazil, Australia, Chile, Canada, USA, South Aisa,Japan, Russia, France, German, Poland, ... , which is twice to 3 times of the common bits. Hot sale!! coal pick for coal mining