1" Bore Live Axle Hub with a 1/4" Keyway and 2 Steel Rim Halves. The hub fits an axle that's 1" Outer Diameter all the way across, no step down. (4) 3/8" Mounting Bolts on a 3-1/2" Bolt Hole Circle. Hardware included. Tire Sizes that fit the 1032 Wheel: 3.40x3.00-5, 4.10-5, 4.10x3.50-5, 11x4.00-5, 11x3.50-5, 11x4.50-5 and 12x4.00-5. All two piece rims require an innertube. Use an innertube with an L Shaped Valve Stem.