Polyurethane-on-iron caster wheels combine high load capacity and floor protection, making them ideal for many industrial environments. They feature a thick polyurethane tread firmly bonded to a heavy-duty cast iron core for a quiet, cushioned ride that wears longer than rubber. Polyurethane resists chemicals, oils, and floor debris, and it won't damage floors like solid iron can. This caster's swivel rig aids maneuverability through turns, and the side lock prevents rolling during loading, unloading, and other operations where stability is required.