Our product makes adjusting seatpost height a breeze. The hollow feature makes it lightweight and adds no extra pressure to your bike.Quick release design makes it easy and convenient to use. T6 thermal treatment makes it have high strength 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: Quick Disassembly Seatpost ClampMaterial: Aluminum AlloyColors: Black, Red, Blue, GoldenFeatures: Quick Release, Wear-resistant, Anti-corrosionSize Details: Size 31.8: 6.4cm x 4.8cm x 1.3cm/2.52" x 1.89" x 0.51" (Approx.)Size 34.9: 6.6cm x 5.2cm x 1.3cm/2.6" x 2.05" x 0.51" (Approx.)Hole 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 Quick Disassembly Seatpost Clamp