Grolsch Strap Locks are an embodiment of the saying, "Necessity is the mother of invention." A Grolsch "strap lock" is actually just a rubber washer from a Grolsch beer bottle. No one knows when the a guitar player in dire need of a locking strap decided to use a red Grolsch washer to secure his guitar strap, but this method has become incredibly popular with guitarists who want to secure their instruments without installing permanent strap locks. For players who don't like the look of traditional strap locks or who want to preserve their instrument's original features, Grolsch washers make excellent (and inexpensive) Strap Locks. Find your new or used Grolsch strap locks for sale with our affiliate partner eBay below today!