The first Faber® "Locking Bridge," based on the original Faber® "ABR-59" bridge. Unlike our current "Tone-Lock" bridges, these do not have removable saddles. Still, a great bridge and, at these prices, you can't go wrong! Get one now before they're gone! Universal! Will fit original Gibson ABR-1 (-6-32) threaded bridge posts, as used on Historics, AND 4MM bridge studs (most imports and the Faber® BSWKIT/NSWKIT), using either the Imperial (inch) or Metric locking collars provided with each bridge. Please note that NASHVILLE bridge equipped guitars need either the Faber® BSWKIT or NSWKIT to mount the locking bridge.