Specifications & Sizing GuidelinesBoat LOADisplacementSea Anchor SizeUnder 25 ft.Under 8,000 lbs9 Foot25 to 33 ft.Under 12,000 lbs.12 Foot30 to 40 ft.Under 25,000 lbs.15 Foot35 to 48 ft.Under 40,000 lbs.18 Foot