Material: Our Bike Bicycle Rear Mech Derailleur Gear Hanger is made of high-quality aluminum alloy material, ensuring a lightweight design without sacrificing strength. The smooth surface without burrs guarantees a durable and rust-resistant product, providing you with a safe and long-lasting riding experience. Enhanced Protection: Designed with your safety in mind, our rear derailleur hanger features a transmission tail hook that absorbs impacts during severe collisions. This innovative design helps protect both your rear derailleur and frame from potential damage, ensuring the longevity of your bike. Easy Installation: Our bicycle aluminum alloy rear gear mech adopts a user-friendly screw design, making it effortless to install and disassemble. Maint.