Krowne Metal 30-151S Casters are designed for versatility and durability. These swivel casters feature a brake for secure positioning and a 5" diameter that allows for smooth mobility. Each caster supports a load capacity of 200 lbs, making them ideal for heavy-duty applications. They are compatible with standard 1" diameter wire shelving posts and come in a set of four, providing a complete solution for enhancing your shelving system's functionality.