Features: Intimate Design: 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 bicycles. Protect Chain: Used for road bikes, effectively prevent chain drop and moving, can guide the chain, protect the chain. Chain Guide keeps the chain from falling in-case-of an over-shift. Strong Compatibility: This Bicycles Chain Guide contains four types of stainless steel screws of different lengths, with strong compatibility, and fits for 34T-50T, 36T-52T, and etc. Convenient To Operate: Easy to operate, and the installation of this Bike Chain Guide can be done without complicated tools, very convenient and practical in daily-life. Fits For: Assembled at the front shifting position, easy to assemble. This Cycling Chain Guide fits road bikes and effectively prevents the chain from falling off that frame. Specifications: Material: Aluminum Alloy Color: Black/Red/Golden/Silver Package Weight: approx.35g Size: As The Picture Shows Package Includes: 1Pc x Bicycles Chain Drop Protector note: Please allow 1-2cm error due to manual measurement. Please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks!