Check the listing for details. Wolf Tooth Blue Axle Handle Multi-Tool - Lightweight Aluminum Trail-Ready Gear. Condition: New. Listed at 38.87 USD. The Wolf Tooth Axle Handle Multi-Tool is a minimalist, lightweight option to cover 10 essential tool functions. It is stored at the end of a Wolf Tooth rear 12mm axle during rides as a multi-tool that is easy to access for quick adjustments and trailside fixes. . Wolf Tooth rear axles require a threaded nut to be added to the end of the axle. This nut is shown in the product photo above and included in the package when purchasing the multi-tool. On one side of the handle is a 5mm hex end stepped to 6mm closer to the handle that fits into the end of an axle. The other side of the handle has a 4mm opening for double-sided hex bits that nest on the inside of the handle via magnet. It was designed for Wolf Tooth axles, though is compatible on other axles that have a threaded end. . Four hex.