Features: Specially designed for seat bows ranging from 7mm to 9mm, allowing you to easily upgrade or replace seats and enhances your riding experience. Make of metal, it has excellent durability and corrosions resistance, and can withstand high strength use. Easy to install, none need for professional tools or technology, quickly solve the problem of incompatible seat tubes. It can effectively prevent the seat cushion from sliding or loosening during cycling, providing more stable support. It has extremely light weight, does not add any extra burden, and helps you maintain optimal riding efficiency. Specifications: Component: Metal Size: about 3x2.8cm/1.18x1.1inch Applicable Seat Cushion Bow: 7-9mm/0.28-0.35inch Package Includes: 1pair Seatpost Clamp note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.