Product Name: Tail Hook Extender   Material: aluminum alloy   Weight: about 18g/set   Application: 34-52T flywheel   High-strength aluminum alloy material, CNC hollowed out and lengthened design, lightweight and beautiful Specifications: installation method The hook extension will be screwed to the previous frame tail hook, After re-use, pull out and install it on the tail hook extension seat.   High compatibility, after the extension of the tail hook is installed, the space between the rear pull guide wheel and the large tooth is sufficient for speed change. Mountain 40/42/46//5052T etc. Highway 34/36/40/42T and other flywheels. Package Included: 1 Extender