T-H Marine T H Marine Z Lock Manual Jack Plate 6in. The new Z-Lock design eliminates side slippage and is made of strong aircraft grade aluminum a full 1/2" thick for strength. It will handle all V6 outboards up to 300 HP and is easy to adjust from the top of the jack. The Z-Lock allows 5" of vertical adjustment and is available in 4" 6" 8" 10" and 12" setbacks. Features of T-H Marine T H Marine Z Lock Manual Jack Plate Available in 4" 6" 8" 10" and 12" setbacks Eliminates side slippage Made of strong aircraft grade aluminum Can handle all V6 outboards up to 300 HP Package Contents: T-H Marine T H Marine Z Lock Manual Jack Plate T-H Marine JPZ-6-DP: T H Marine Z Lock Manual Jack Plate 6in