The Shepherd Hardware 2-1/2 inch swivel polypropylene wheel caster are non-marking and impervious to water with good chemical resistance.

2-1/2 inch diameter black polypropylene wheel with ball bearing swivel and plate mount
2-13/16 inch x 3-7/8 inch plate
175-lb load capacity
Economical solid polypropylene wheel with load-appropriate steel rig and plate
A great choice for lightweight durability and chemi resistance