XL Radio box grommet with boots. The aluminum fitting is longer for thicker transoms and radio boxes. Aluminum grommet fitting for radio box. Makes securing or replacing the boots to the radio box an easy task. Measurement: Will fit upto a 6mm thick radio box or transom for steering rods. See picture two for more dimensions. Includes: 2 boots & 2 grommets per pack. See picture one. Note: Replacement boots if needed are pn# ose-80454