Tianjin Shiruida Machinery Import& Export C... is a China largest state-owned manufacturer who is specialized in manufacturing and marketing all sizes of drill pipes, integral heavy weight drill pipes, drill collars, non-magnetic drill collars, spiral drill collars, Casing &tubing, VAM Flush joint equivalent OCTG. Please kindly have a browse at our website: ***** The mill has established 35000 square meter workshop, equipped with 180 sets of all kinds of equipments and 500 staff, in total 300 million investment. By now the production volume has been up to120000 joints of drill pipes and 10000 joints of drill collars each year. The mill manufactured strictly according to the API quality requirements, and has acquired the certificates of API SPEC 5D, API SPEC 7, API 5CT, API 5L, API SPEC Q1, ISO 9001:2000, ISO/ TS 29001. Welcome to visit our mill and make further inspection, if you are searching for stable & credible supplier. Thanks and Best regards ***** Sales Manager ------------------------------------------------------------- Tianjin Shiruida Machinery Import & Export Co., Ltd Add:East#15, Chengfa Industrial Zone, Hedong District, Tianjin, China Website: ***** E-mail: *****</p>