These heavy-duty casters are made of a high-quality steel and cast iron mix, making them durable and resistant to rust. They can hold up to 1000 pounds each, making them suitable for a wide range of handling tasks. The swivel and rigid design allows for smooth and quiet rotation on any floor surface. These casters are versatile and can be used for pallet jacks, material carts, furniture, and more. Installation and replacement are easy, and the caster wheels come with axle and nut replacements.