High strength makes it wear-resistant and not easy to break. Quick release design makes it easy and convenient to use.Hollow and lightweight design make it add no extra weight to your bike. Seatpost clamp is anodized, which makes its surface glossy and anti-corrosion.This seat tube clamp is made of aluminum alloy. It is sturdy and has good corrosion resistance.We have different sizes for you to choose.It is suitable for bike, road bike, mountain bike.Item Name: Seatpost ClampMaterial: Aluminum AlloyColors: Black, Red, Blue, GoldenFeatures: Quick Release, Wear-resistant, Anti-corrosionSize Details: Diameter: 3.18cm/1.25", 3.49cm/1.37" (Approx.)Notes:Due to the light and screen setting difference, the item's color may be slightly different from the pictures.Please allow slight dimension difference due to different manual measurement.Package Includes:1 x Seatpost Clamp