Fender locking tuners let you lock your strings at the tuning machines for maximum tuning stability. Each package contains one die-cast tuner with removable tuner cap. Note: Tuning machine posts are different heights (High E, B, and G tuning machines are slightly shorter than Low E, A, and D). Please review item description to ensure proper ordering. Used on American Deluxe Series (USA) and some Custom Shop instruments. Also used on Strat Plus models. Can be retro-fitted to most US and Mexico made Stratocaster and Telecaster models. Some modification may be necessary. Will not fit American Vintage Series (US).