• Aluminum alloy seat post clamp. • Lightweight, strong, and durable. • Color-resistant surface, excellent anti-corrosion. • Provides security to the saddle. • Suitable for all types of bicycles. • Easy to install with threaded locking nut. • Inner diameter: 31.8 mm, for 27.2 mm, 28.6 mm seat post. • Includes 2 seat post clamps. • Ideal for mountain, road, folding, and children's bikes. • A good gift for bike lovers.