The Dinghy Wheels is designed for portable boats with a rigid transom. We are not recommending using these dinghy wheel on the boat more than 200 Lbs. The Dinghy Wheels will make your portable dinghy easy to maneuver over sand, parking lots and boat ramps. They are great for aluminum, fiberglass and wooden transom, the extra wide wheels are more powerful than equivalent models. Non-Corroding/Rusting lightweight material with special treated process, the wheels have great strength.