Guitar belt buckle and strap lock set designed to secure your strap, protect your instrument, and add a stylish touch. Key benefits Secure fit: Nonslip tail nail with screw design holds the strap firmly in place to prevent accidental detachment during playing. Comfortable handling: Smooth nails and edges will not hurt your hands when installing or adjusting the strap. Easy installation and removal: Flat head screw design allows quick screwing in and unscrewing for fast setup or changes between instruments. Versatile compatibility: Suitable for acoustic and electric guitars, basses, mandolins, and ukuleles so you can use the same hardware across instruments. Functional upgrade: Includes guitar belt screw bolt to simplify strap conversion and improve fit stability when replacing or upgrading strap buttons. What it does Acts as both a decorative belt buckle and a reliable strap lock, keeping straps snug and secure while you play. Replaces worn or loose strap buttons and provides a consistent mounting point for straps. Smooth finish minimizes wear on the strap and reduces the chance of scratching instrument finishes during installation. Attributes Function: strap lock, belt button, and tail nail for strap security Compatibility: acoustic guitar, electric guitar, bass, mandolin, ukulele Design features: flat head screw, nonslip screw thread, smooth nails Performance: secure hold, easy to install and remove, gentle on hands and straps Use scenarios Live performance: Secure your strap before a gig to avoid strap slippage while moving on stage. Instrument swap: Quickly remove the strap from one instrument and install it on another for rehearsals or recording sessions. or upgrade: a worn strap button on an acoustic guitar to restore a tight, reliable connection and reduce strap wobble. Package notes Hardware is supplied for simple installation with standard driver tools. Follow your instrument maker recommendations for placement and torque to protect the finish and wood.