-Mminimalist, lightweight option to cover essential tool functions. It is stored at the end of an axle during rides as a multi-tool that is easy to access for quick adjustments and trailside fixes - 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 two double-sided hex bits that nest on the inside of the handle via magnet - Compatible with Wolf Tooth axles that have threaded axle bolt - Includes: Four bits: 2, 2.5, 3, and 4mm hex; flat head #3.5 and Phillips #2 screwdrivers; and T10 and T25 Torx-compatible, hex adapter