The YakAttack FullBack Backing Plate with Hardware provides a 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. For installation in tough to reach places, install with the Rigging Bullet (RB1032). Length: 2.5 in / 6.35 cm, Width: 2 in / 5.08 cm, Height: 0.25 in / 0.64 cm,