They do exactly what it says on the box.
If you have a Warwick bass, they are the same product that came with it.
This means that if you want more lock-equipped straps, these are the ones to get.
If you want to get a straplock-system, these are OK. They lock securely and look great, but the strap will sit quite a long way from the body of the instrument.
If you already have strap mounts, you might have to fill that hole first.
Pros: Can be used as a regular strap-mounting-point with other straps, attaches securely, easy to install.
Cons: Changing old strap-mount-points can be troublesome, the strap is moved almost 2cm from the body of the instrument.