Description: 1. Made of aluminum alloy. 2. Suitable for 34T-50T, for 36T-52T, for 39T-53. 3. Easy to install. Specification: Name: Bicycle Chain Anti Drop Device Material: aluminum alloy Applicable: for 34T-50T, for 36T-52T, for 39T-53T Weight: about 14.4g Color: black, red Packing List: Chain Guide*1 Set [ Great Aluminum Alloy Materials ] This Chain Catcher Bike is made of aluminum alloy, which enhances the hardness, reduces the weight, is easy to carry, and will not bring extra burden to the bicycle. [ Prevent The Chain From Falling ] This Chain Guide can effectively prevent the chain from falling into the frame, prevent damage to the of the frame, and protect your bicycle. [ Universally Compatible ] This Bicycle Chain Guide has four stainless steel screws of different lengths, with strong compatibility, suitable for 34T-50T, 36T-52T, and 39T-53T. [ Easily Install ] This Bike Chain Guide is easy to install, no complicated tools are required to complete the installation, and it is fast and convenient. [ Safe to Use ] Assembled at the front shifting position, easy to assemble. This Cycling Chain Guide fits road bikes and effectively prevents the chain from falling off the frame.