E-FAK Universal Mountain Road Cycling Bike Bicycle Rear Derailleur Guard Rack Protector GOOD QUALITY: Strong Steel material for protection and weight up to 100g weight. FANTASTIC FUCTION: Provide effective protection for rear derailleur, prevent the derailleur was struck distorti on or displacement in riding to ensure the safety of the riding. EASY INSTALLATION: Single fixed hole can be easily installed. LARGE RANGE OF USE: Universal size suitable for most mountain bikes, road bikes, folding bicycles, racing bikes. GUARANTEED: 100% Guaranteed to return the goods by free without any reason