I bought this spanner in order to be able to quickly adjust the action of my Les Paul type guitar at the bridge. Unfortunately, no matter what I do the teeth cannot get a grip on the "thumbscrews" on the bridge. It also can't grip any hex nuts, it just rounds their edges. Absolute waste especially at the price. My multitool works much better for this application.
Won't be returning this since that would be a waste of resources. Thoroughly disappointed as most other HB stuff is usable.