Ibanez MTZ11 RD Multi Purpose Tool for Guitars and Drums 11 in 1 tool. The Ibanez MTZ11 Guitar Multitool is the guitarist's ultimate string-change and maintenance tool. Engineered by Ibanez, it is ideal for string changes and setups. Packed into a convenient folding multi-tool, you get hex wrenches, philips screwdrivers, and a ruler.