Check the listing for details. GRAINGER APPROVED 64328 Stem Caster Kit,2"dia,PU,550lb,PK5 19YX31. Condition: New. Listed at 68.53 USD. Stem Caster Kit, Swivel Caster, 550 lb Load Rating, 300 to 999 lb, 2 in Wheel Dia., 1/2 in Wheel Width, Polyurethane Wheel/Tread Material, 2 1/16 in Mounting Height, Plain, 7/16 in x 7/8 in Caster Stem Size, Friction Ring, Nylon Caster Frame Material, Unfinished Frame Finish, Yes Non-Marking, 2 Number of Wheels, Package Quantity 5 These friction-ring stem caster kits come with multiple casters and are used for applications where all the casters on a piece of office furniture or equipment need to be replaced. These casters are installed on chairs, carts, fixtures, and similar items used in environments where the casters won't be exposed to heavy loads, chemicals, liquids, or high temperatures, such as offices and retail settings. Soft-wheel casters are less likely to damage hard tile or woo.