The Gamakatsu Spring Lock features a stress-relieved, stainless steel center point. The center point makes it easy to find the exact midpoint of the bait. It’s then just a simple matter of twisting the plastic on to the Spring Lock where it stays fastened and secure. Soft plastics stay centered and run straight and true. Made of stainless steel, the Gamakatsu Spring Lock won’t rust. Available in L and XL sizes.