Mesee Guitar Strap Locks Buttons Replacement Accessories for Electric Classical Guitar Ukulele Bass High-quality metal with the polished surface, they are rustproof, wear-resistant and durable.Non-slip Tapered Design, uniform force, not easy to fall, to prevent sudden fall on the stage.Bass strap-locks buttons allow to hold your guitar tightly, allows you to stand, play, and move around.Guitar strap locks replacement parts are widely used for acoustic guitar, classical guitar, electric guitar, bass, ukulele, banjo and all standard straps. Easy Installation1. Drill two small holes in your guitar2. Screw in the base of the two provided screws and locks3. Slide on the quick-release mechanism4. Attach your guitar strap (not included) and tighten it down to the quick-release part on the top and lock it into place.5.