Twistlock  Centering-Pin Spring (CPS) is designed for weedless-style rigging of larger plastics like big swimbaits, flukes, tubes and creature baits. With its Twistlock "Centering-Pin Spring" (patented) attached to the hook eye, baits can be "permanently" secured by inserting the pin in the center of the nose of a soft plastic, which can then be screwed onto the Twistlock coil spring to rig perfect everytime!