Rigid Polypropylene Wheel, Radius 3-3/16". Formed from a single piece of heavy-gauge steel, deeply corrugated to withstand stress and prevent distortion under full-rated load
Lightweight, single-piece aluminum design provides strength, durability and corrosion resistance
Single ball raceway with hardened and polished ball bearings
Kingpin riveted and coined for durability in rated service
Corrosion-resistant zinc finish.