Krowne Metal 28-151S casters are designed for durability and convenience. Each caster features a 5" diameter wheel with a robust load capacity of 220 lbs, making them ideal for heavy-duty shelving applications. The locking mechanism ensures stability when needed, while the grease-resistant material enhances longevity and ease of maintenance. These casters elevate your equipment by 6", providing added clearance and mobility. This set includes four casters, perfect for enhancing your shelving system's functionality.