LSR roller nut reduces friction that can cause tuning instability. Comes with instructions, mounting hardware and Wilkinson® adapter for older Strat® Plus models. Used on American Deluxe HSS guitars. Kit Includes: LSR Nut, Shims, Mounting Screws and Bezel Adapter (for Retrofitting to Wilkinson® Nut Equipped Guitars) Will Accommodate String Gauges from .008 to .056. Some modification may be required.