T-H Marine ATLAST 4 Set Back Hydraulic Jack Plate - Heavy Duty Black. ATLAST 4 Set Back Hydraulic Jack Plate - Heavy Duty Black. T-H Marine's ATLAST Hydraulic Jack Plate is now available in a "HEAVY DUTY" upgrade. With the new ATLAST HEAVY DUTY, the product is available for applications on even larger outboards, rated for engines up to 400 hp. 5 REASONS YOU SHOULD CHOOSE THE ATLAST HYDRAULIC JACK PLATE. ATLAST is truly the best hydraulic jack plate in the world. ATLAST is factory installed by more boat manufacturers than any other plate. ATLAST is used by more professional fisherman ...