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 [ Excellent Aluminum Alloy Materials ] Features aluminum alloy, Chain Catcher Bike enhances the hardness, reduces the weight, is easy to carry, and will not bring too much burden to the bicycle. [ Bike Chain Protector ] We know how frustrating it is that bicycle chains are always easy to fall off, so we’ve designed the Chain Guide to prevent the chain from falling off and moving. [ 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. [ Convenient Installation ] Simple installation, the installation of this Bike Chain Guide can be completed without complicated tools, saving too much trouble. [ Safety First ] This Cycling Chain Guide is assembled in the front shifting position, and it is easy to assemble. Suitable for road bicycles to protect the frame .