Swivel Stem Caster Kit, Caster Frame Material Steel, Caster Wheel Diameter 5 in, (2) Swivel, (2) Swivel with Brake Caster Wheel/Configuration, Caster Wheel/Tread Material Polyurethane, Standard Caster/Wheel Mounting Location, Caster Wheel Width 1 1/4 in, Standard Caster Wheel Type, Stem Caster Mounting Type, Face Contact Brake Caster Brake Type, Polyurethane, Wire Shelving Compatible Product Type, 4 Swivel Casters (2 with Brakes)