Tone-Lock™ KIT comes with a Faber® TP-59 lightweight aluminum tailpiece and Tone-Lock™, with 2 steel studs, in METRIC thread (8M x 1.25 for imported Epiphone and most other imported guitars) plus 3 pairs of spacers to place your tailpiece at your preferred height. Spacers can even be “stacked” for further customization and comfort. This is the best and most innovative tailpiece locking system available today and the best sustain enhancing product you can buy for your stop tailpiece equipped guitar.