High strength gasket makes it and not easy to break. Seatpost clamp has CNC craftsmanship and is anodized, which makes its surface glossy and anti-corrosion.High hardness and design make it more attractive to people. The beautiful color and delicate workmanship make it a good gift for people who like cycling.This seat tube clamp is made of aluminum alloy. It is sturdy and has good corrosion resistance.The length of the product is 6.4cm, the width is 4.6cm, and the thickness is 1.5cm.Diameter 31.8mm seat clamp is suitable for 27.2/28.6mm outside diameter seat rod. Diameter 34.9mm seat clamp is suitable for 30.4/30.8/30.9/31.6mm outside diameter seat rod.Item Name: Bike Seatpost ClampMaterial: Aluminum Alloy 31.8mm, 34.9mmColors: Black, Red, Blue, Golden, Silver ColorFeatures: Quick Release, Wear-resistant, Anti-corrosionSize Details: Size: 6.4cm x 4.6cm x 1.5cm/2.52" x 1.81" x 0.59" (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.To select s, you need to measure the outer diameter of the tube in the frame, and select the corresponding s.Package Includes:1 x Seat Tube Clamp