Size dimensions (link diameter x overall length x link opening, weight/each): 1/8 x 1-1/2 x 1/4" .5 oz, 3/16 x 2 x 11/32" .8 oz, 1/4 x 2-1/2 x 3/8" 1.2 oz, 5/16 x 3 x 7/16" 2.8 oz, 3/8 x 3-1/4 x 1/2" 4.3 oz, 1/2 x 4-1/4 x 5/8" 8 oz, 5/8 x 6 x 3/4" 20 oz. Weight capacity rating: 1/8 x 1-1/2" 44 lbs, 3/16 x 2" 165 lbs, 1/4 x 2-1/2" 220 lbs, 5/16 x 3" 440 lbs, 3/8 x 3-1/4" 550 lbs, 7/16 x 3-7/8" 600 lbs, 1/2 x 4-1/4" 660 lbs, 5/8 x 6" 720 lbs.