Features: *31.8mm for Caliber: This bike seatpost clamp is designed for 27.2-28.6mm bike seatposts, ensuring a perfect fit. *High-strength Aluminum Alloy: Made of aluminum alloy, this bike seat clamp provides high strength and durability. *Rust: With an oxidation process, this bicycle seatpost clamp is highly resistant to rust, offering long-lasting performance. *Easy to Install: Available in quick-release and locked styles, this bike tube clamp allows for easy installation and disassembly without the need for tools. *Lightweight: Weighing only about 50g, this seatpost clamp is lightweight and won't add extra burden during your ride. Specifications: *Product Name:Bike Seatpost Clamp *Material:High-strength Aluminum Alloy *Size:31.8mm for Caliber *Color:Black/Silver/Yellow/Red/Blue Package Content: Seatpost Clamp*1 Note: 1. The real color of the item may be slightly different from the pictures shown on website caused by many factors such as brightness of your monitor and light brightness. 2. Please allow slight manual measurement deviation for the data. Features: Bicycle Seat Tube Clip Designed to Fit Standard Post Sizes of For 27 2 28 6mm Material: light weight, good strength and well temperature resistance, good impact resistance Appearance and performance: automatic cutting, smooth edge, fit most of the road bicycles, delicate texture. Compatibility: smooth surface and exquisite workmanship, fit most of the bicycles. Easy Installation: Brand new and high quality, easy to install.