Dec 28, 2022 · Crafted from 316 Marine Grade Stainless Steel, our 1/4" and 5/16" diameters of 5' and 7' anchor chains for boats ensure durability and corrosion resistance for long-lasting marine use. Choose the perfect fit for your boat - available in 1/4" x 5' and 5/16" x 7' options, providing flexibility for various applications.