Designed for clamp-on mount outboard motors up to 35 hp. Improves performance and handling of smaller or lighter boats. Also allows mounting of long shaft motors to shorter shaft transom boats. Engine mounting surface is 11-1/2 in. x 10 in. . This cast aluminum offset type jack plate is designed for clamp-on mount outboard motors up to 35 HP. The Mini Jacker allows mounting of long shaft motors to shorter shaft transom boats. The mini-jacker stands off transom 4 in. . The engine mounting surface is 11 1/2 in. wide x 10 in. high and features a vertical offset of 3 in. . The overall width of transom mounting flanges is 17 in. .