Features 1、This seat post clamp is made of qualified carbon fiber, solid, firm and durable to use, ensures a long time service. 2、30.2mm clamp is compatible for 27.2mm seat post caliber, and 34.9mm fits for 30.8mm and 31.6mm seat post caliber. 3、Adopting premium surface machining, not easy to deform, corrosion prevention, outstanding durability. 4、Long mounting screw used to fix the clamp onto the seat post. Easy to install, no complicate procedure needed. 5、Suitable for kinds of road and mountain bicycles. Features: This seat post clamp is made of qualified carbon fiber, solid, firm and durable to use, ensures a long time service. 30.2mm clamp is compatible for 27.2mm seat post caliber, and 34.9mm fits for 30.8mm and 31.6mm seat post caliber. Adopting premium surface machining, not easy to deform, corrosion prevention, outstanding durability. Long mounting screw used to fix the clamp onto the seat post. Easy to install, no complicate procedure needed. Suitable for kinds of road and mountain bicycles. Specifications: Condition: 100% Brand New and High Quality Material: Carbon Fiber Color: Black Inner Diameter: Approx. 30.2mm / 1.1inch, 34.9mm / 1.3inch Width: Approx. 18mm / 0.7inch Weight: Approx. 28g Packing List: 1 x Seat Post Clamp Package List