Super strong backing plate is used inside the hull for ultra duty attachment of the GT175 GearTrac. Provides backing support that is superior in strength to standard self threading screw installation, and provides significantly more surface area contact than nuts and washers. One GT175 Backing Plate covers 4" of GT175 GearTrac. Sold in a single pack. Works with the classic GT175, Top Loading GT175, and the GT175 Gen II GearTrac.