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 containing one black pair
and one red pair.