1 Pcs Bicycle Frame Gear Tail Hook Extender

[Name]: Extend Tail Hook / Rear Dialing Converter [Weight]: about 11.7g (including screws) [Material]: Made of high quality aluminum alloy and processed by CNC. It is strong, firm, durable and corrosion resistant [Installation]: The screws provided with the extender need to be installed with a 6mm wrench [Features]: extended rear dialing dedicated, suitable for 40T/42T/46T/50T mountain freewheel or 32T/36T highway flywheel, to expand the freewheel speed change more smoothly