SeaSense Navy Anchor 28-Pound, Vinyl Coated Model # A - B - C - D 5 lbs. 9" 4-3/4" 6" 3/8" 10 lbs. 12-1/2" 7" 8" 3/8" 15 lbs. 12-1/2" 7" 8-1/2" 3/8" 20 lbs. 12-1/2" 7" 8-1/2" 3/8" 28 lbs. 13" 9" 10-1/2" 3/8" Model # Boat Size 5 lbs. Up to 12' 10 lbs. 12' to 15' 15 lbs. 15' to 17' 20 lbs. 17' to 19' 28 lbs. 19' to 21'