Faster and easier than grabbing and holding splitshot while trying to pinch it on the line. You just pinch off a little putty, roll it into a ball, Then pinch it on. Saves time when you need a little weight in a hurry.
This is an awesome tool to have in your pack. It lets you add or take off weight from your split shot to adjust your nymphing set up and makes it a lot easier than messing with those little beads. A bit of a sleeper, but something that you'll find useful!