Wheel casters like the 3inch-Caster-005 are used to roll your built machine or equipment back and forth. Diameter of the caster wheel is a metric standard 75mm that is equal to 2.953" inch with imperial units. Dimensions of the caster wheel is 40mm (1.575" inch). The caster dimensions heightwise is 195mm/7.677" inch. This wheel caster can be mounted using a Top Plate with the dimensions of 110mm x 100mm x 4mm fork:3.5mm and holes distance of 85mm x 75mm. Rolling with a wheel core material of Polyurethane and Polypropylene and a Polyurethane and Polypropylene tire rolled over ball bearing. Each caster will carry the load of 441 lb and is Fixed type. Last and not least the temperature range = -40 to 180 F. Remember, you will have to buy the 3inch-Caster-005 in order to have it :).