6-ring mechanism,trigger 6-ring mechanism,stationery ring clip item NO.:TR130-6-20/20 material: metal length:135mm width:20mm inner diameter: 20mm outside diameter: 26.2mm height: 27mm binding thickness: 16mm packing: 532pcs/ctn we are speciialized in producing all kinds of stationery clips, ring mechanism, round ring clip, round ring binder, etc. Other information about us: 1. About 10 years experience in plastic manufacturing 2. Upgraded the quality system base on ISO9001:2000 for production 3. Well equipped with completed facilities and professionally skilled employees 4. environmental-friendly material and quality, SGS test reports can be offered if necessary. 5. OEM service is welcome 6. All of our products are offered in a competitively low price and of high quality. You are most welcomed to visit our factory if you are convenient.