ATTWOOD U-BOLT STYLE TIRE CARRIER. Square bend U-bolt with bracket mounts tire on tongue or trailer frame. The frame must be between 2 Inch x 2 Inch square and 3.5 Inch x 4 Inch rectangular in size. Fits 4- or 5-lug hole rims. Extra-long 8.5 Inch shaft fits 8 Inch to 15 Inch tires. Zinc-plated steel. Skin pack. …