25.4mm/28.6mm/31.8mm Bicycle Aluminum Alloy Single Nail Seat Tube Seatpost Clamp Specifications: Made of high-quality aluminum alloy material, it is lightweight, durable, rust-proof, and also has long service life. Simple design make it easy to install and convenient to use. The inner diameter of 31.8mm is generally suitable for 27.2mm bicycle seat tube, 25.4mm is suitable for 22.2mm seat tube, and 28.6mm is usually suitable for 25.4mm seatpost. There are a variety of specifications to choose from, please confirm in advance that your seat tube size matches. Item Name: Bicycle Seatpost Clamp Material: Aluminum Alloy Features: Lightweight, Durable, Rust-Proof, Long Service Life Inner Diameter: 25.4mm/1", 28.6mm/1.13", 31.8mm/1.25" (Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x Seatpost Clamp