Bike Seat Post Clamp Aluminium Alloy Bicycle Quick Release Seatpost Collar 25.4mm / 28.6mm / 31.8mm /34.9mm Features: The bicycle seat clamp is made of aluminum, light and durable, comfortable and safe. Easy install, very convennient and practical. Quick-release lock design, quick disassembly, making riding more comfortable, stable and safe. Suitable for most racing bike, MTB, BMX, road bikes, mountain bikes, please confirm before ordering this bicycle seat clamp can be installed on your bike seat. Specification: Item Type: Bike Seatpost Clamp Material: Aluminum Alloy Color: Black, Red, Blue, Silver, Gold Size: 25.4mm/28.6mm/31.8mm/34.9mm - 25.4mm: suitable for 22.2mm seat posts - 28.6mm: suitable for 25.4mm seat posts - 31.8mm: suitable for 27.2mm & 28.6mm seat posts - 34.9mm: suitable for 30.4mm & 31.8mm seat posts Note: The seatpost clamp should match the diameter of the seat tube on the frame, not the diameter of the seatpost itself. For example, if the seatpost tube diameter of a bicycle is 30.9mm, you will most likely need a 34.9mm seatpost clamp. Package Included: 1x Bike Seatpost Clamp