Feature:1. Wear Resistance: It is made of aluminum alloy with high strength and wear resistance2. Light Without Weight Gain: Aluminum alloy material, large area hollow, light without weight gain3. Feel Good: CNC cutting, polishing, smoothly face without burr, and feel good4. 3 Colors: Products are available in red, blue, black, 3 colors for your choice, to add some beautiful color to your ride5. Excellent Performance: Ergonomic hollow design, excellent performance, durable, ultra light and easy to installSpecification:Item Type: Bike Seat Post ClampMaterial: Aluminum AlloyProduct Caliber: Approx. 31.8mm / 1.3inProduct Application: Sitting Rod Diameter is 27.2, 28.6mm, 31.8mm Seat ClampApprox. 27.2mm / 1.1inApprox. 28.6mm / 1.12in.Package List:1 xBike Seat Post Clamp