Amarine-made Stainless Steel Marine Boat Stern Bow Eye Tie Down U Bolt (1/2-Inch and 3/8-Inch optional) Machined AISI 304 stainless, Come with adjustable finished nuts Includes 2 flanges and all 4 nuts. max safe load is 3,500 lbs Amarine-made Bow Eyes come with adjustable finished nuts as compared to the crimped ring used on most bow eyes. 1/2" and 3/8" optional, more size see pictures