Serves a variety of rings, screws: side hung / side / side pull rings, screws / rotation rings / bolted ring / rotating rings this side pull screw rotating rings is our best-selling a product now, blackening bolt metric Thread and Inch threads have two bolt, 4-fold safety factor, a total of 11 kinds of specifications Metric: M8 / M10 / M12 / M16 / M20 / M24 / M30 / M36 / M42 / M48. Inch thread because too much size, in here is not stated, if you want to know about the side pull rotating rings of information, or inch rotating rings of information, please call our company. Our company mainly sells a variety of lifting accessories , lifting spreader, shackles, a variety of hooks, rings, screws, rotating rings imports, import tackle other lifting products, welcome to inquire and look forward to cooperating with you. Tianjin Iron owl, Ltd. Contact: Zhang small call: 0`2`2`-8`4`8`7`8`2`9`9` phone: 1`3`7`5`2`4` 2`5`8`1`9 ?? QQ: 2`7`8`8`8`6`9`4`5`4 1. only won the British SGS ISO 9001 certification??. ? 2. German Security Certification Consortium BG-PRUFZERT product certification form. ? 3. But also by the American Bureau of Shipping ABS. The Norwegian Bureau of Shipping DNV. ? 5. South African National Standards Laboratory SABS full range of product quality certification. ? 6. CSA Canadian Standards Organization certification.