Description: 【Material】The bike chain guide is made of high quality aluminum alloy material, lightweight, high strength, and durable, providing a better riding experience. 【Design】Our chain guide is suitable for a wide range of bicycle types, and the chain/connecting post is adjustable in multiple places. 【Effective Chain Protection】The bicycle chain guide can effectively prevent the chain from falling off and moving, without worrying about dropping the chain and extending the life of the chain, and smoother ride. 【Easy to Install】The seat tube clamp chain guide is easy and convenient to install, adjustment with wrench, no need to disassemble the crank. 【Application】The bicycle chain protector is a useful tool for bicycle owners to improve their bicycles, It is simple and stylish, suitable for matching bicycles of various colors. Specification: Material: Aluminum Alloy Size Chart: 7cmx5cmx7cm/2.76inchx1.97inchx2.76inch Package Includes: 1 Bike Chain Guide Note: Please allow slightly errors due to manual measurement and different monitors.