This product listing is for a 7/16" Grip Ring Stem with a 5/8" Plastic Socket Sleeve to fit into many types and brands of Utility Carts and Equipment that have a 5/8" or 7/16" Tubing or Hole Size. These fit directly into Rubbermaid Utility Cart Model Number 3424-88, 3355-88, 4000, 6118, and many more types of rubbermaid carts. Our listing is for a high quality but cheap priced caster that will replace your current casters without going over budget. This is for a 3" Diameter by 1" Wide Industrial Plastic Wheel in a 3" Swivel Caster Rig and includes the white socket with every caster. Light Duty Caster with Zinc Plated Steel with Lacquer Dip Yoke, 7/16″ X 1 1/8″ Mount, 3″ X 1″ Polyolefin Crown Tread Black Wheel with 5/16″ Plain Bearing and 5/16″ Axle and Nut. Excellent choice for many applications including Drum dollies, Ingredient bins, Lab equipment, Parts carts, Display, racks, Janitorial equipment, Portable conveyors, Garment racks, Library book carts, Dish trucks, Tool carts, Office equipment, Garment racks, Distribution carts, Automotive equipment, and more. Our Series 10 Light Duty caster line is ideal for lighter load capacities under 200 lbs. This highly functional, economical workhorse product line is employed in a wide range of applications that include janitorial, hospitality, institutional and food service.