Feature: 1. Hollow out style, lightweight and beautiful while ensuring strength. High-quality material, strong, durable and has long life. 2. 28.9mm center distance greatly enhances compatibility and is easily compatible for mountain 40/42/46/50/52T and for road 34/36/40/42T. 3. The total length is only 50.8mm, achieving high compatibility and stability (too short center distance affects compatibility; too long center distance affects stability). 4. The structure is upgraded, accurate adjustment and increase the response speed of variable speed. Abolish the limit position, increase the fine-tuning range and make it easier to adjust. 5. The tail hook fitting surface adopts radial grooves to increase friction and solve the problem of looseness caused by vibration during riding. The locking screw made of 7075 aluminum alloy, and the locking torque is greater. Specification: Condition: 100% Brand New Item Type:: Derailleur Hanger Extender Model: RA105 Material: Main Body AL6061 + Screw AL7075 Quantity: 1 Piece Recommended Torque Value: 15-20N.M Center Distance: Approx. 28.9mm / 1.1in Total Length: Approx. 50.8mm / 2.0in. Package List: 1 x Derailleur Hanger Extender1 x Accessory