The interchangeable stainless steel Centering Pin Springs (CPS – U.S. Patent 7,841,127) are compatible with Owner Twistlock hooks, and can be attached to hook eyes. Once inserted in the center of a soft plastic bait’s nose, simply screw the bait onto the coil spring for a secure and “permanent” rig every time! With three sizes available, you can maximize the holding strength for any bait size, making these CPS far superior to barbed stick-pin holders.