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. Guitar Strap Buttons Straplocks Tail Nail End Pins with Screws and Washers Flat Head for Acoustic Guitar Electric Guitar Bass Banjo Ukulele Set 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. 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 strap buttons. Screw size: . 30 x 4mm/1.18 x 0.16inch; Button inner diameter: . 8mm/0.31inch; Button outer diameter: . 15mm/0.59inch Colour:gold+black+silver Material:Metal Package Contents: 30x Guitar Strap Buttons Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.