Upgrade your ride with adjustable bike seat clamps Made with strong materials for durability and serves the main purpose of securing the saddle This pack includes bike seat clamp Measure before purchasing to get a perfect fit Specifications: Name: Bicycle Seat Tube Clamp Material: Steel Angle: Adjustable Net Weight: Approx. 4.7 oz Fixture: Bolt Screws M8, External Hex Nut Tool: M13 spanner (including spanner) required for installation application: steel and aluminum etc. Metal seatpost and Used for connecting and securing saddle rails Compatible models: Shrink seat post (round tube outer diameter 22mm), Saddle rail height 6-7mm Package list: Bike seat clamp *1 Note: Due to lighting effects and camera angle, product color may vary slightly from color and photo color due to manual measurement, product size may exist tolerance.