4" Precision Bearing Swivel Caster with Brake - $15 Each or $50 for a set of 4. Feature(s) Zinc-coated steel construction resists corrosion. Easy-to-apply brake locks the wheel. Polyurethane wheel for high load capacity and extended wear. Protects floors and resists chemicals, caustics, acids and oils. Application(s) Ideal for many uses, including hospital equipment, food service, utility carts, store fixtures, office equipment, toolboxes, etc.