The Owner CPS 5124 Centering Pin Spring is an interchangeable nickel-plated spring designed to be attached to a compatible hook eye. Its central shaft guides the screw-on attachment of the lure’s nose to keep it centered. The dimensions are 11 × 3.2 mm for size S, 16 × 4 mm for size M, and 18 × 6.5 mm for size L. Each packet contains eight springs.