Read CMC Marine's Warranty Policy Here CMC Static Jack Plates – 5” Vertical Extension The 5 INCH VERTICAL EXTENSION allows the motor to be mounted 5 inches higher than the standard mounting height on the transom. It is a must for conversion from prop to jet drive. Another application includes mounting the 5 inch vertical extension on a hydraulic jack plate to raise the motor higher on shallow running boats that are equipped with tunnel extensions. Constructed of Extruded 6061-T6 Aluminum alloy. (#50012) OEM/Bulk Product Name Packaged 50012 CMC, 5" vertical extension