- Tighten and loosen the most common sizes of jacks and pots on instruments, amplifiers and other audio equipment - Three thin-walled tube sockets: 12.7 mm (1/2"), 11.1 mm (7/16") and 12 mm (0.47") in one compact tool - Dimensions: 110 x 90 x 90 mm EUR 16.00 - See more - Buy online