The guitar strap security locks by Harley Benton is an inexpensive but excellent solution to stop worrying about dropping your guitar or bass if your strap belt detaches.
I previously had a more expensive famous brand locks mounted on my guitar, but I lost the strap belt, and with it the actual parts of the locks attached to it. I decided to give the cheaper Harley Benton locks a try, and I did not notice any difference with the more expensive brand ones. In addition, I was pleasantly surprised that the Harley Benton locks were perfectly compatible with the guitar-side parts of the locks of the more famous brand which I still had screwed to the guitar body, so I didn't need to replace them, and could use the new ones for a second guitar.
I have been using these Harley Benton security strap locks for over half a year now, and they never failed, so I feel confident enough to recommend them. Mounting them was fairly easy, although I had to very slightly cut (maybe 1mm) the leather around the upper hole in my strap belt to be able to tighten the lock properly. Once mounted, they can be attached/removed pretty much on the fly, and while they aren't perfectly noiseless, the clicking sound is very minimal.
Overall, thoroughly recommended, and looking forward to add these to more guitars and basses in the future: 5/5