Security Lock with ingenious design, superb materials and outstanding quality define our worldwide market leader. For decades the most popular strap lock system for guitar and bass. Protects your instrument by preventing accidental release of strap. Including high-grade felt washers for ultimate protection of guitar's finish. Including additional pair of extra-log screws for use on Gibson models. Schaller Security Locks can be used on acoustic guitars as well. Screw Security Lock pin into tailblock and heel. Avoid screwing into the unreinforced part of the sides. Features: Model: Metal, Unit: Packed in Pairs, Weight g/item: 22. Surface: Ruthenium