Check the listing for details. 2 Set 0.8" B7 2 Hole O Ring Binder Mechanisms, 25mm Silver Tone. Condition: New with tags. Listed at 20.31 USD. These Binder Mechanisms have significant advantages in organizing files and notes and have become the preferred tool for many people. In addition to being a file organization tool, they can also be used to make notes, notebooks, etc., meeting the diverse needs of users.Specifications:Color: Silver Tone;Size: 123 x 20 x 30mm / 4.84 x 0.79 x 1.18 inch (L*W*H);Ring Inner Height: 20mm / 0.79 inch;Recommend Paper Size: B7 2 Hole;Material: Metal;Packing List: 2 SetAdvantage:The Binder Mechanism is made of durable and long-lasting metal material. This allows it to withstand the wear and tear and collisions of daily use and extend its service life.The O-ring uses a circular structure to achieve uniform distribution of loose-leaf pressure, which provides better stability when binding thick documents.