The bulbous end makes a perfect stop for small sliding rings, or for trapping big pellet wagglers into position. Two or three Grippa Stops next to each other provide adjustable stops for link legers, light bombs and small feeders.
The direction of the stop on the main line can also be reversed by taking it off the wire onto a loop of nylon and then transferring it to the reel line. They are made from a tough yet forgiving material that doesn’t damage the line.