Feature:1. HIGH QUALITY ALUMINUM ALLOY: This bicycle quick release seat tube clamp uses high quality aluminum alloy bicycle seat clamps, which are lightweight, durable and rust proof. They are anodized, and have a fade resistant surface and strong corrosion resistance.2. HOLLOW DESIGN: This bicycle seat tube clamp adopts a hollow design, is light in weight, easy to install and disassemble, avoids tedious procedures, and is suitable for cycling enthusiasts. Suitable for all kinds of bicycles, non slip and firm, suitable for protecting your cute bicycles.3. THE DIAMETER OF THE SEAT TUBE CLAMP: The diameter of this bicycle seat tube clamp is 31.8mm / 1.25in, which is suitable for 27.2mm / 1.07in, 28.6mm / 1.13in outer diameter seatposts. 29.4mm / 1.16in seat tube clamp should be used for 27.2mm / 1.07in sitting rod of partially dead flying, please confirm by actual measurement.4. DURABLE AND LIGHTWEIGHT: This bicycle aluminum alloy quick release seat clip is a durable and lightweight alternative. It adds some beautiful colors to your riding and makes it easy to adjust the height of the seat post.5. PURCHASE INSTRUCTIONS: Choose according to the outer diameter of the frame riser mouth, the frame riser is printed with the caliber size, that is, the size of the tube clamp; Most of the seat tube will be marked with the caliber of the seat tube, pull out the pole that can be seen.Specification:Item Type: Bicycle Seat Tube ClipsMaterial: Aluminum AlloyInner Diameter: Approx. 31.8mm / 1.25inApplication: the diameter 31.8mm / 1.25in seat pipe clamp, suitable for 27.2mm / 1.07in, 28.6mm / 1.13in outside diameter of the sitting rod, 29.4mm / 1.16in seat tube clamp should be used for 27.2mm / 1.07in sitting rod of partially dead flying, please confirm by actual measurement.Choose according to the outer diameter of the frame riser mouth, the frame riser is printed with the caliber size, that is, the size of the tube clamp; Most of the seat tube will be marked with the caliber of the seat tube, pull out the pole that can be seen.Package List:1 x Seat Tube ClampNote:Please allow 0‑2cm / 00.8in error due to manual measurement. Thanks for your understanding.