Approximately 40mm distance between mounting holes (Nickel mounting screws #6-32 x 3/8"); designed to upgrade the cheap and replace nasty stock switches that come with most guitars and basses | Nice durable sturdy switch with metal body - one piece shell to minimise "flexing" damage from any knocking on the switch tip | Solid construction with shielding and solid feeling switching, smooth detents and quiet, no extraneous noise when switching | Body is enclosed and screwed shut, to avoid things from effecting contact points, with ground tags on both sides | Enclosed ball bearing operation. The thick, cast metal case provides a superior base and housing for the toggle and circuit board, also provides a more solid feel to the overall switch when it is mounted to the guitar