Made of aluminum alloy material, good quality and wear-resistant. Lengthened arm design provides extended reach, lightweight and labor-saving. The seat tube clamp is thickened and widened for added strength and durability, stabilizing the seat tube and extending service life. Frame bayonet design ensures a secure fit to prevent the seat tube from slipping. Equipped with 2mm hex socket screws for secure fastening of the seat tube. Simple and detachable assembly design features a high-strength nylon washer that is durable, wear-resistant, and non-scratching to metal components. Specification: Material: Aluminum Alloy Size: 46x73.5mm / 1.81x2.89inch, compatible with 39.8mm / 1.57inch seat post Package Includes: 1 Piece Folding Bike Seatpost Clamp Note: 1. Please allow slight measurement deviations due to manual measurement. 2. Due to differences in monitor displays, the image may not reflect the actual color of the item.