- 10mm: for mini potentiometers/blend pots / Gotoh SG series. - 11mm: for potentiometers / push-pull control pots. - 1/2": for CTS potentiometers. - 16mm: for the knurled nut of Japanese toggle switches. - Multi: for the knurled nut of U.S.-made toggle switches or others. - 1 1/18" (30mm) square.