Mountain bikers and road cyclists - every serious rider should have a spare derailleur hanger like this TOOYFUL replacement! This little aluminum bracket might seem insignificant, but it's actually a crucial safety component that protects your frame and derailleur in crashes. The 3# size measures about 2.56 inches (6.5 cm) long and features a smooth silver finish with good texture quality. Made from durable aluminum alloy, it's strong enough to handle trail impacts but designed to break before your frame or expensive derailleur does. Installation is straightforward with the included screw - just make sure you get the proper alignment and torque it correctly. The quality is noticeably better than cheap generic hangers - precise machining ensures proper fit and shifting performance. Every bike model has slightly different hanger designs, so this specific 3# size fits particular MTB and road bike models (check compatibility before ordering!). Having a spare in your toolkit is like insurance against being stranded on the trail with a bent or broken hanger. The packaging includes one hanger with screw, ready for when you need it. For the price, it's smart preventative maintenance that could save you from much more expensive repairs down the line. Serious cyclists know that carrying a spare hanger is as essential as carrying a tube or multi-tool.