huangshan wannan machinery co., ltd., formerly shanghai no.7 machine tool works, was set up in 1928. it has a history of more than forty years of producing milling machines since 1958, and is one of the main 25 professional factories for milling machines in china. it's professional manufacturer and exporter of machinery with broad product range including ordinary machinery, cnc universal machines and combination machining center. in chain transmission products range we offer standard and specialized sprockets, taper-bushed sprockets, qd sprockets, pulleys, gears and taper lock bushes etc., under standard en, din, ansi, bs standards. company has in possession of iso9001:2000 certification and self-operational export and import permission.