Ring Binder Mechanism 1. File security for file turn smoothly and ... scratch files, without opening match hook mouth 2.O China Ring Binder Mechanism,File Folder P123 02 25R/20 Material: metal1 ... , 25mm, 30mm, 35mm, 40mm, 45mm, 50mm, 65mm,78mm5. Shape of ring: Q, R, D6. Type available: patent products and common products7. OEM ...