You will receive: the package includes 1 Pcs 31.8 mm bicycle seat tube clamp, we provide you with multi-color styles for you to choose, enough to meet your use needs Size Measurement: Please be sure to measure the actual seat tube OD of your frame before purchasing and choose the product that matches you. 31.8mm clamp suits for Frame Seat Tube 30.2mm-32.1mm; 34.9mm clamp suits for Frame Seat Tube 33.5mm-35.2mm Easy to install: Our seatpost clamps are hollow, you just need to adjust the seat to the right height and then fix the clamps, which makes you more convenient when installing and dismantling Scope of application: the seat tube clamp can be applied to road bikes, mountain bikes, folding bikes, track bikes, fixed-gear bikes and other styles of bicycles, it is your best choice Material: Hose clamps are made of aluminum alloy, which is durable and anti-corrosion, Weight: 0.0440924524 pounds, Manufacturer: LICQIC