Faber® “Tone-Lock”™ MASTER KIT All Pro Sustainer System™ parts can now be ordered in one convenient “Master Kit,” at a 5% discount over buying the parts separately. The “Tone-Lock”™ MASTER KIT includes “Tone-Lock”™ studs and spacers, a TP-59 tailpiece and a “Tone-Lock”™ Bridge. Choose the INCH kit to completely upgrade your ABR-1 equipped guitar (i.e., Gibson Historics and any guitars using ABR-1 style 6-32 threaded bridge posts), or a Nashville bridge equipped guitar (requires optional Faber® bridge studs). Choose the METRIC kit for guitars with 4mm bridges posts (i.e., non-USA made guitars, such as Tokai), or, using the optional Faber® E-Sert, for many Epiphone guitars and other non-USA made guitars using a bridge system with large body inserts. See product descriptions for further details.