Mount your spare tire vertically to the side of trailer tongue or frame rails. The trailer tongue in the front of the trailer. The offset design moves the tire and wheel up and away from the trailer frame to improve ground clearance. No drilling is required to install the carrier because the included U-bolts clamp the carrier to the trailer frame. The crisscross design increases the holding power of the U-bolts. Mouting u-bolts may be crossed to fit shorter frames or may be installed parallel for more reach. Offset height raises tire and provides additional ground clearance3/16" thick galvanized steelHolds either 4 or 5 lug wheels that are up to 15"Fits frames up to 4" tall by 1" up to 3-1/2" wide