➤IconCasterWheels 6 inch Steel Wheel Casters, come in a 4-pack which includes: 4 Rigid Casters. ➤These heavy duty industrial casters set of 4 wheels make it easier to move heavy industrial equipment with ease as its high load capacity rolls smoothly in the toughest environment or surfaces. ➤Each heavy duty casters has a load capacity of a 1200 lb. (4,800 per Pack) - 4 Per pack. ➤These metal casters are durable and are able to withstand extreme temperatures, lowest -40°F to 500°F. ➤The caster swivels 360-degrees. ➤Our metal casters have completely sealed ball bearings for smooth swiveling and the best protection against dust and debris. ➤The kingpin-less swivel raceway distributes impact better than standard kingpin casters, enabling smooth swiveling and extending service life. ➤The axle nut for these casters are 1/2" diameter, with Double ball bearings with hardened raceway for extra strength. ➤The Top Plate Overall Size is: 4" x 4-1/2" | Bolt Hole Spacing: 2-5/8" x 3-5/8" slotted to 3" x 3" | Attaching Bolt Size: 3/8" | Includes: Roller Bearing , Metal Spanner Bushing | Plastic Washer