The 2-piece adjustable jack has 5" of slot adjustment at the motor mounting bracket and 1-1/2" of adjustment at the transom bracket. Made of 6061 T6 extruded aluminum alloy. Stainless steel fasteners for maximum strength and durability. Designed to fit standard B.I.A. bolt pattern without drill holes or making modifications in the boat or motor. Rated up thru V-6 motors.