Metal Guitar String Locking Nut Kit for FR Tremolo Systems A precisionmachined locking nut and hardware kit designed to improve tuning stability, reduce string breakage, and deliver clearer, more consistent tone. Built from metal with careful workmanship for a comfortable feel and reliable performance when used as a replacement or upgrade. Key benefits Improved tuning stability: Locking nut and fine tuners keep strings secure for more accurate pitch and less tuning drift after heavy tremolo use. Reduced string breakage: Stable string anchoring lowers stress and helps prevent frequent string failure. Precision feel and finish: Precision processing and solid metal construction provide a comfortable, durable component that fits performance and needs. Easy installation: Kit includes all screws and a wrench for straightforward fitting on compatible tremolo systems. Broad application: Designed for FR tremolo systems or similar series tremolos as a direct replacement or upgrade component. What is included 1 x Guitar String Locking Nut 6 x Saddle Mounting Screws 6 x Fine Tuner Screws 6 x String Lock Insert Blocks 2 x Mounting Screw 1 x Wrench Material and color Material: Metal Color: Silver Color option: Black/Silver Compatibility and function Replacement string lock screws set compatible with FR tremolo systems or similar series tremolos. Provides stable string locking and precise tuning adjustment with the included fine tuner screws and insert blocks. Reasonable structural design focused on playing comfort and reliable string retention. Practical use scenarios Live performance: Maintain tuning stability during aggressive tremolo use and extended sets. Recording studio: Achieve more consistent pitch and sustain for tracking and overdubs. Practice and home setup: worn hardware or upgrade your bridge assembly to reduce maintenance and improve playability. Notes on installation and performance All mounting hardware and a wrench are included for installation. Precision tuning and stable string locking support improved playing effects and sound clarity. Suitable as a direct replacement or as an upgrade for guitars equipped with FR style tremolo systems.