Feature: 1. Lengthened design: Greatly enhances compatibility; easily compatible with flywheel expansion schemes such as mountain 40/42/46/50/56T and road 32/36/42T. 2. Function: It is used to convert a small flywheel into a large flywheel in order to make the bicycle faster, such as replacing a 36T flywheel with a 42T flywheel. 3. Main body material: The tail hook is made of high quality aluminum alloy, durable, sturdy and firm. 4. Product size: The size of the tail hook is about 63x23x11.5mm. 5. Great Accessory: The bike rear derailleur hanger is a great accessory for cycling enthusiasts. Specification: Origin: Mainland China Main material: Aluminum alloy Product color: Red/black/blue/gold Product size: about 63x23x11.5mm/2.48x0.91x0.45in Product net weight: about 18g Function: Used to convert a small flywheel into a large flywheel in order to make the bike faster, such as replacing a 36T flywheel to a 42T flywheel Note: Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you! Please allow 1-2cm measuring deviation due to manual measurement.

1 X Rear Derailleur Hook