Feature: 1. Arch Angle Design: The rear derailleur guard rack arch angle design makes the protector not easy to deform under strong impact force. A single fixed hole can easy to mount on your mountain bike. 2. Effective Protection: The rear dial protector shape conforms to most mountain bike, provides effective protection for the rear derailleur, prevent derailment. 3. Premium Steel Material: Bike derailleur protector made of full superior steel material, with high cost performance, better performance, anti rust and durable, lightweight, high strength, and has a long service time. 4. Applications: The derailleur guard rack is universal size, suitable for most mountain bicycles, road bikes, folding bikes. 5. Easy Installation: The single fixed hole is easy to install, only needs to be fixed in the corresponding hole, only needs to be locked under the rear wheel for quick release or fixed screw. Specification: Item Type: Bike Rear Derailleur Protector Product Material: SteelProduct Color: BlackProduct Weight: Approx. 66g/2.3ozProduct Size: Approx. 8x6x4cm/3.1x2.4x1.6in Product Application: for Most Mountain Bikes, Road Bikes, Folding Bikes. Package List: 1 x Bicycle Rear Derailleur Protector Note: Please allow 0‑2 cm error due to manual measurement. Thanks for your understanding.