Features: FEATURE: This is a top mount design in which the mounting screws go through the top of the unit. EASY TO FIX: The guitar locking nut has headstock string retainer bar,can fix the strings more better. ANTI-RUST: This guitar locking nut is made of zinc alloy, which is not easy to rust and oxidize and increase the service life. EASY TO INSTALL: Includes one 42mm guitar locking nut, mounting screws & mounting hardware. FIT FOR: Fits 6-string electric guitar with 42mm neck at the nut, can be used with your double lock system. Specifications: Material: Zinc Alloy Color: As The Picture Shows Package Weight: approx.35g Size: approx.4.15x1.5x0.7cm/1.63x0.59x0.27in (More Size Detail, Please See Photo.) Note: Please allow 1-2cm error due to manual measurement. Please make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks! Package includes: 1Pc x 42mm Locking Nut