Description: Rust resistance and corrosion resistance makes it have a longer service life. Tight threads and uniform force make it less prone to slipping during rotation. Exquisite and professional workmanship makes it very strong and durable. Simple and convenient installation steps will not waste your time and effort. Made of aluminum alloy material, it is very durable to use. The inner diameter of this product is 3.49cm. It is suitable for seatposts with outer diameter 30.4/30.8/30.9/31.6. Item Name: Quick Release Seatpost Clamp Material: Aluminum Alloy Features: Uniform Force, Tight Thread, Quick Release Size Details: Inner Diameter: 3.49cm/1.37" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Quick Release Seatpost Clamp