Fender Strap Block, 4-Pack (Black x2/Daphne Blue x2)

The most reliable and hassle-free instrument strap lock system ever devised. No need to remove or replace existing strap buttons on your guitar; just slip easily installed Strap Blocks over the existing strap buttons and that™'s it - you™'re ready to go, with your strap locked securely in place.
Strap Blocks work with most OEM strap buttons, and are available in convenient four-packs.