Wheel casters like the 8inch-Lock-Swivel-Caster-014 are used to roll your built machine or equipment back and forth. Diameter of the caster wheel is a metric standard 200mm that is equal to 7.874" inch with imperial units. The thickness of the wheel is 50mm or 1.969" inch. The caster dimensions heightwise is 268mm/10.551" inch. Mounted via a Top Plate that has the size of 138mm x 110mm x 10mm and the holes distance of 110mm x 75mm. The caster core is made of Cast iron polyurethane and has a Cast iron polyurethane tire with a low friction Precision double ball bearing. Each caster will carry the load of 1543 lb and is Swivel and Upper Locking type. Temperature range = -40 to 180 F. Remember, you will have to buy the 8inch-Lock-Swivel-Caster-014 in order to have it :).