This pocket-size toothed wench will tighten or loosen most nuts or thumb wheels found on guitars, like output jack, control pot, pickup switch, tuning machine and bridge thumbwheels. All edges and surfaces have been chamfered and polished to avoid damage to body and surrounding area. Specially angled for clearance over a guitar body or peghead. Suitable for guitar, bass , etc. Features: Handy pocket-size wrench quickly fixes loose jacks, pots, switches and tuners. One end of the Multi Spanner is toothed for loosening a nut; the other end tightens it. For use on many different sizes of nuts, which makes it great for your guitar case; no need to carry around multiple wrenches. Store this little stainless steel wrench in your guitar case. Specification: Size: approx. 94 x 28 x 2 mm / 3.7 x 1.10 x 0.08 inches (L x W x D) Color: silver Material: Stainless steel Position:Guitar string changer Weight:26g Package includes: 1pc* volume knob switch screw fork