Men are stupid about knives. It's one of those subjects like guns and fast cars that gets the old testosterone flowing. And we all know what effect that has on clear thinking. As a result, too many dive knives look like Steven Segal action figure weapons. They come finished in black, too, for midnight murder.
Most models are also available in sharp-pointed versions.
All these knives did the job, some faster than others, as noted. The blade guard is good, a wide V, though the handle is a bit short. Release is smooth and engagement is positive. There's no provision for bolt-mounting, though, just straps or belt and strap. With a butt cap and lanyard hole.