They're cheap, they look good and they do a good job keeping your strap on so I use a lot of them.
I have been through many forms of strap "keepers" on my guitars (Dunlop & Schaller strap locks, oversize buttons, various washers over the strap etc.). The mechanical locks stick out & you can't get the guitar in the case with the strap on, + they may vibrate some during playing. The washers work well but are a pain to get on & off. I have switched several guitars to the Grippers. They are cheap. lightweight, fit in the case, are easy to install, and hold the strap securely while playing but make it easy to take the strap off. I just bought some more for different guitars.
These worked really well on a few cigar box guitars I made. They installed nice and tight in the 1"x2" popular thru the body neck. Used many other stew mac parts as well.
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