At less than three inches long, the Mini-Multi is the world's smallest multi-tool for guitar and bass! Some players don’t always adjust truss rods, so we removed those sizes (don't worry, our popular GTMLT1 Multi-Tool covers them) and took a deep-dive into sizes needed for tremolo systems as well as action, pickup height, and other basic work. It includes hex wrenches, screwdrivers, precision ruler, and a super-handy bottle opener for those important moments when you need it. Like all our products, both inch and metric sizes are provided for fit on virtually all makes and models of guitars and basses. Tools are pro-grade and absolutely dependable.