Including either roller, taper roller, or precision ball bearing, H Series is available in 4 to 12 in. dia, with load capacities from 330 to 3,300 lb. They use bolt-on style directional locks, which are bolted on underneath top plate, using top plate mounting bolts. Swivel models are fitted with oblong top plates, with wheel options including rubber tire, cast iron, steel, nylon, and standard polyurethane.