Constructed of aluminum and plated steel. This kit fits under engine clamps and is designed to prevent motor from jumping off the transom. Also prevents damage to the transom by the clamps. All parts furnished for simple hook up. Mariner: 9.9, 15 HP – 1982 and newer. Suzuki: 9.9, 15, 16, 25 HP – 1982 and newer. Johnson/Evinrude: 9.9, 15, 25, 30, 35, 40 HP – 1977 and newer. Yamaha: 9.9, 15 HP – 1984 and newer.