The RoboWorm Rebarb Hook is designed specifically for fishing super soft plastic worms. There is a molded plastic barb on the shank of the hook which holds the worm on tight. You use less plastic worms and spend more time fishing than fixing! RoboWorm currently puts ReBarbs on Gamakatsu and Daiichi hooks. When rigged properly, the plastic ReBarb is pushed through the worm and then backed up to wedge against the plastic to prevent the worm from sliding down.