Duo lock snaps, without the swivel, easy to change lures and knot holds much better than tying directly to crankbait.
BTW I never understood why people tie their line to the split ring on crankbaits????? Any bigger or stronger running fish is going to break it easily. I'm even more amazed when i see fishing celebrities and tv shows who advertise it as a correct way of attaching lures to the line. Wonder why?
Some of my favorite lock snaps come from Owner, fastech, and berkley, mustad. Try and avoid buying the cheapest, because that's what you'll get.
#00 size duo lock is good for trout as well as those tiny clips some people use for streamers.
If you can get a hold of some dentist wire, round nose pliers and some spare time you could make snaps that will be of excellent quality and outlast anything available at local stores.