This pocket‑sized tooth‑shaped wrench will tighten or loosen most on the guitar,such as output,control potentiometers,pickup switches,tunings pegs. All edges and surfaces are chamfered and polished to avoid damage to the area around the instrument.And specially angled for clearance over a guitar body or peghead. Installing a new guitar is very easy,you can adjust the tension so that your guitar sound is stable.For use on many different sizes of,which makes it great for your guitar box. The guitar spanner tuner wrench is stainless steel,owns and long service life.Soft backing keeps the metal off your gear. Handy pocket‑size wrench quickly fixes loose,pots,switches and tuner.end of the multi spanner is toothed for loosening a nut; the other end tightens it.Easy to use.