Features1Carbon fiber clamp with a locking threaded nut. 2Solid and durable, good finish and lightweight. 3The clamp diameter in 30.2mm can be mounted to 27.2mm seat post. 4The clamp diameter in 34.9mm can be mounted to 30.8mm or 31.6mm seat post.SpecificationThis carbon fiber seat post clamp is solid and lightweight. Can be mounted to 27.2mm, 30.8mm or 31.6mm seat post.Features:Carbon fiber clamp with a locking threaded nut.Solid and durable, good finish and lightweight.The clamp diameter in 30.2mm can be mounted to 27.2mm seat post.The clamp diameter in 34.9mm can be mounted to 30.8mm or 31.6mm seat post.Specifications:Color: BlackMaterial: Carbon fiberDiameter: 30.2mm / 34.9mm (optional)Weight: 20g / 0.72oz(30.2mm), 22g / 0.8oz(34.9mm)Package List:1 * Seat Post ClampPackage List1 * Seat Post Clamp