The Ibanez MTZ11 is the perfect multi-tool for mobile guitar maintenance. The MTZ11 combining 11 tools in one handy chassis, the MTZ11 includes hex wrenches, screwdrivers, a tube spanner and a ruler. The easy-to-handle MTZ11 is designed to solve all your set-up troubles when you’re on the road or prepping for a gig. hex wrench: 1. 5mm/2mm/2. 5M/3mm/4mm/5mmtube spanner: 7mmscrewdriver: Phillips-head large/Phillips-head small/slot-head ruler: 50mm.