For use with either polymer or steel MetroMax stem caster posts. Promotes easy cleaning by allowing shelving units to be moved easily for access to floors and walls. Create a cart to efficiently move supplies throughout a facility or campus. Stainless horn, axle, and stem with sealed bearings appropriate for cart-washable applications. Bumper included with each caster. 5" diameter polyurethane flat wheel tread with 1.25" face.