metal 2 ring mechanism

metal 2 ring mechanism, metal 2 ring binder clip 2-ring mechanism:  shape of ring: O/D/Q                     Length available: various from 87mm to 298mm                     Width available: various from 15mm to 36mm                     Inner diameter: various from 15mm to 78mm                     Color: nickel/silver Pull-open or with trigger.   Features: 1) durable and environmental-friendly         2) can be easily attached and detached         3) rust resistant         4) high quality with competitive low price         5) can be customized