Left and right wings 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 protect the rear derailleur. Universal size suitable for most MTB bikes, road bikes, folding bicycle. Material: Steel Color: Black, Silver Size: approx. 10cm x 5cm x 4cm Net Weight: 110g approx Quantity: 1 Pc ​ Features: 100% new and high quality! The shape conforms to most of the mountain 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 protect rear derailleur when tripped, is very reliable. Left and right wings 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 protect the rear derailleur. Universal size suitable for most MTB bikes, road bikes, folding bicycle. ​ Brand Pancbike SKU 100277001_NP-1020531063