Guitar Nut Cube 5 in 1 Luthier Tool Multi-Purpose guitar nut tool Hosco Brand - Made in Japan Heavy gauge stainless steel - .035"(.9mm) thick 10mm : for mini potentiometers / blend pots / Gotoh SG series SG series 11mm : for potentiometers / push-pull control pots 1/2" : for CTS potentiometers 16mm : for knurled nut of Japanese toggle switches Multi : for knurled nut of U.S. made toggle switches or others You will find many uses for this versatile tool around the shop. Keep one of these in your guitar case for emergency work on your guitar. This tool is strong enough to be used to remove stubborn knobs.