The ST350 Stern Thruster from Sideshift is perfect for boats up to 50' in length; the unit mounts to the underside of a horizontal surface like a swim platform. No tunnel or motor inside the engine compartment is required. All mounting holes are above the waterline. Mounting to a vertical surface like a transom can easily be done with the optional Stern Mounting Bracket. Offering an immediate response with its powerful water cooled 24V motor, the heavy-duty 8" aluminum propellers quickly pull the boat quietly and smoothly. Saltwater proven, the rugged aluminum and stainless steel thruster is anode protected to prevent corrosion. It is finished with anti-fouling paint over epoxy primer. 23.5" W x 16.75 " L. 27 lbs.