I love these little guys! Rather than ordering an expensive strap lock system that requires installation and pretty much permanently marries a strap to a particular guitar, these little guys just fit right over a standard strap and strap button and do a fine job of making sure your guitar doesn't go anywhere. No modifications, no installations, easy going on and coming off. I use these whenever I play with a strap and I have never had a single complaint.
Shipping included in price.