1,000 lbs Capacity Per Caster (4,000 lbs per set of 4) Contains 2 Swivel Casters with brakes, and 2 rigid casters without brakes. This series is made of 1/4 thick cold rolled steel; designed, formed, and welded for optimal mobility and made to withstand the rigors and abuse typically seen in Medium duty applications Double ball raceways offer smooth swiveling action, strength and long service life. Sound Town STLC2-4PACK 4-Pack 2 Swivel Caster Wheels with Brake, Replacement Part for Rack Case, Home Furniture, Trailer Industrial Castors Set Of 4 Heavy Duty Polyurethane Caster Wheels (Swivel Caster With Polyurethane Castor Wheels NSF Listed & RoHs Compliant Heavy-Duty Polyurethane Swivel Locking Casters - Lee Valley Tools Zerk grease fitting in raceway & axle for maintenance. Zinc plated finish is attractive & corrosion resistant.