Passed CE certification and ISO9001:2000,Dia 89-219mm length 190-3400mm,used in the steel industry,harbor,coal industry,etc We have professional engineers and all of them have rich experience in this field, we can design the goods independently. Standard: GB, ISO, CEMA, DIN, JIS, ETC Production capacity: as usual 5000 pieces/ week, but urgent order is acceptable Certificate: CE, ISO, BV, SGS, IKA ...