Features: 100% brand new and high quality This quick release seat post clamp is extremely strong and light. Engineered to provide an efficient clamping action without slipping even in wet and muddy conditions. It's great for any style of bike in need of securing a seat post. Easy to install and use. Hollow lever design and rust-resistant high quality retaining bolt. Thumb screw for accuracy & a quick release lever for ease of use. It is a little good partner for your bicycle, MTB. Material:Aluminum alloy Caliber: 31.8mm,34.9mm 31.8mm seat post clamp is generally suitable for 27.2mm seat post 34.9mm seat post clamp is generally suitable for 30.8mm-31.6mm seat post Color:Black, Red, Blue, Gold, Silver Specifications: Material: Aluminum alloy Specification: 6*5*1.5cm Gross weight: about 22g/24g Packaging: OPP Package Includes: 31.8mm/34.9 bicycle seat pipe clamp * 1pcs Notes: 1. Please allow 1-2 cm error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from real object.