Features: Made from highly strength aluminum alloy, ensures its durability against wear and tear. Features a hollowed out design that significantly reduces its weight. Enjoy a lighter bike without compromising on strength. The bicycles seatpost clamp utilizes a screw and nut locking systems, which automatically adjusts angles and prevents deformation caused by concentrated stress when tightened. With its simple design, this bicycles seat tube clamp can be easily installed without any hassle. Whether you have a mountain bike, or road bike, this clamp will provide a secure and adjustable fit. Specifications: Component: Aluminum alloy Size: about 44x35mm/1.73x1.38inch Inner diameter: about 30mm/1.18inch Package Includes: 1Pc Bicycles Seat Tube Clamp note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.