Shape conforms to most of bike, to provide effective protection for rear derailleur, prevent the derailleur Was struck distortion or displacement in riding to ensure the safety of the riding. Can also be used rear derailleur when tripped, is very reliable. Left and right slot, with the aid of frame can be more fastness install on the frame. Single fixed hole can be easily installed. Protector uses aluminum material and arch angle suppress, make the protector is not easy to deformation under the strong impact force, effective the rear derailleur. Universal size suitable for most MTB bikes, road bikes, folding . Specifications: Product: rear dial protector Color: black Material: steel Size: Length: 77mm , Width: 52mm,High:35mm Stay tuned for more colors Note: Due to different production batches or different shooting light and display, please allow an error of 1-3 cm for manual measurement. There may be slight differences in color and details, but please rest assured that this will not affect the use effect. Thank you for your positive feedback and support, please feel free to buy! Package Included: 1 Rear Gear Derailleur Protector