You just slide the line through the hole in the sinker with the pointy end up before tying your line to your gap hook. I suggest 2/0 with a rubber worm. Now you are fishing a texas style rig. Yes they are reusable.
I'm pretty sure these are just typical "bullet" sinkers invarious sizes, so they all just have a hole that you thread your line through -- nothing to pinch like a split shot sinker. If you find instructions on texas or carolina rigging online, you'll see how they get on and off--no biggie.
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