T-H MARINEHI Jacker HP Jack Plate 6 Setback HP" for high performance, this new high strength design jacking plate meets the strenuous Requirements of the latest high performance outboards such as the the OMC Ficht, Mercury Optimax and Yamaha 3.1 Liter. Designed with all the features of our popular Pro Hi-Jacker™ series, but from full 1/2" aircraft aluminum stock. Our new "wide side" design adds a full 2" of material to the adjustment slot areas on the side of the plate for additional strength. To to