34. 9MM Aluminum Alloy Screw Locking Seat Clamp Rod Clamp For Fixed Flywheel Mountain Bike Road Bike ( Black ) Description Light, nice and sturdy bike seat post clamp will ornament your bicycle. Smooth rounded edges and low stack height are convenient for seat clampâ€s . Round edge design and powerful bolt closure provides a firm seat clamp grip for retention and security. Firm design offer comfortable and efficient installation. Feature- Color: Black.- Material: Aluminum Alloy.- Size: 3. 49 x 3. 40 x 3. 49cm.- Strong Material: The seat clamp is made of CNC machined aluminum alloy. Heat treatment to guarantee high- strength, lightweight and durable working life.- Size & Use: 34. 9mm are available, suits for 30. 4mm/ 30. 8mm/ 30. 9mm/ 31. 6mm ( outer diameter ) seat post.- Quality Superiority: The strong retaining bolt adds more clamping power and securely to fit the seatpost into the frame tube.- Vase Compatibility: MTB, mountain bike, commuter, road bicycle, etc.- Recommendation: Your choice of bike seat clamp size depends on the bike frame or seat tube size, please measure its external diameter before purchasing.- Color: Black. Package Including 1 x Parts