The Albion Industrial Caster Wheels Set of 4 features grease fittings on 4.75-inch wheels, making them ideal for material handling and industrial use. Manufactured in the United States, these caster wheels from Albion are designed for durability and reliability, providing smooth and efficient mobility for various applications. With a set of 4 wheels, this product offers stability and maneuverability for equipment or machinery in need of caster wheels.