This guitar end pin was designed to secure the strap to your guitar without any bulky hardware or dedicating a strap to a specific guitar. Use any strap with any guitar and have the security of a locking system with these end pins..Elaborately designed for acoustic guitar, classical guitar, electric guitar, bass or ukulele and all standard straps. The modern design which would look great on any your guitar..The bell shape combines function and style by locking your strap in place while complementing the aesthetics of your guitar or bass. Rubber strap blocks easily slip on and off strap buttons, safely secures strap to instrument..Simple and inexpensive, help match and protect the finish of your guitar easily, great replacement for your original strap buttons..Screw size: Approx. 30 x 4mm/1.18 x 0.16inch; Button inner diameter: Approx. 8mm/0.31inch; Button outer diameter: Approx. 15mm/0.59inch, Package includes: 2 x Strap buttons, 2 x Mounting screws, 2 x Ruber washers.