These Taiway 6.5 mm Flat Washers are great because they are completely flat with no locking/anti rotation tab that often comes with mini toggle switches, the tab is never used with guitars so it always mounted facing upwards (instead of down into a locating hole below), this is not only ugly but also means you can catch your finger on it whenever you use the switch, so this washer makes for a much nicer finish.

These have a 6.5 mm mounting hole so they will fit mini toggles switches with both M6 / 6 mm metric threads and 1/4-40 imperial threads.

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