Width - 12 in., 15 in., 18 in., and 24 in. overall. Frame - 2-1/2 in. deep x 1 in. flange x 12 ga. powder painted formed steel. Couplings - Straight sections have bolts on one end, hooks on opposite end. Curved sections have gravity hooks on both ends. Straight Section Lengths - 5 ft. & 10 ft. straight sections. Curves - Curves have 48 in. outside radius on 12 in., 15 in., 18 in. widths and 60 in. outside radius on 24 in. width. Wheels - 1-15/16 in. O.D. ball bearings run in hardened raceway with life-time lubrication. Zinc-coated steel. Axles - 1/4 in. dia., threaded one end with locknut. Spaced on 3 in. or 4 in. centers, specify. Capacity - See Load Capacity Chart below.