Features: Arch Angles Designs: The rear derailleur guard rack arch angles designs makes this protector not easy to deforms under strong impact forces. Effective: The rear dial protector shape conforms to most mountain bike, provides effective protections for the rear derailleur, prevent derailment. Material: The bike derailleur cover is made of stainless steels, which are cost-effective and lightweight, high strength and long service life. Applications: The derailleur guard rack is universal size, suitable for most bike, mountain road bicycles, road bikes, and folding bikes. Easy Installation: The single fixed hole is easy to install, only needs to be fixed in the corresponding hole, only needs to be lock under the rear wheel for quick release or fixed screw. Specifications: Material: Stainless Steels Color: As The Picture Shows Package Weight: approx.70g Width: approx.66mm/2.59in Hole Size: approx.10.5mm/0.41in (More Size Details, Please See Photo.) 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! Package includes: 1Pc Bike Derailleur Protector