Swivel/Brake Stem Caster, Caster Wheel/Configuration Swivel with Brake, Caster Wheel Type Tread on Core, Caster Wheel Bearings Sealed, Caster Wheel/Tread Material Polyurethane, Caster Frame Material Stainless Steel, Caster Mounting Height 6 1/16 in, Caster Mounting Type Stem, Caster Stem Length 2 3/16 in, Caster Wheel Diameter 5 in, Gray, Silver, Overall Height 8 1/4 in, Overall Width 3 3/8 in, Compatible Manufacturer Model Number Industrial Plastic Shelving Racks, Includes Bumper