T-H Marine CMC Atlas Series Heavy Duty Hydraulic Jack Plates - Black 4, 6, 8, 10, and 12 Heavy-Duty Atlas Hydraulic Jack Plates are rated for engines up to 400 HP. Atlas hydraulic jack plate is designed to meet the demands of todays high performance outboards. This one piece design featuring the innovative rod, and slot lifting system will handle the stresses from the heaviest and most powerful outboards, 400hp or less, on the market today. All of the hydraulics are built into the jack eliminati