Quickly fixes loose jacks, pots, switches and tuners. Great pocket size tool to keep handy in your guitar case too. Quickly fix loose output jacks, control pots, tuning heads and pickup switch. ( see photos ) Turn adjustable bridge thumbwheels more easily, too. One end of the Multi Spanner is toothed for loosening a nut; the other end tightens it. A mere .075" (1.90mm) thin, the tool can fit under a control knob and is specially angled for clearance over a guitar body or peghead.