Features:1. Made of high quality aluminium alloy with exquisite workmanship, which is smooth, lightweight, durable and wear-resistant.2. The inner diameter of the clamp is 34.9mm, fit for 30.4/30.8/31.6mm bike seat post.3. Simple and convenient design, easy and quick to install.4. Suitable for most types of aluminum frame bikes, like mountain bike, road bike, etc.5. Available in 5 colors, you have more choices.Specifications:Condition: 100% Brand NewItem Type: Bicycle AccessoryMaterial: Aluminium AlloyOptional Color: Black, Red, Blue, Gold, TitaniumDiameter: 34.9mm / 1.4inchFit For: 30.4/30.8/31.6mm seat post(the bicycle should be aluminum frame)Weight: Approx. 25gPackage Include:1 x Seat Post Clamp.Note:Only suitable for aluminum alloy frame, carbon fiber material cannot be used.