Constructed of rust-resistant zinc-coated steel. Two 410/350 x 4 pneumatic tires allow gate to roll open without sagging or dragging. Attaches to fencing with 2in. to 3in. dia. tubing using 2 U-bolts. Wheels (qty.): 1, Works With: 23 in. dia. tubing, Wheel Type: Dual, Tire Type: 410/350 x 4 pneumatic