Mounting 3inch-Caster-012 is the solution of making your project to move around by pushing. Diameter of the caster wheel is a metric standard 75mm that is equal to 2.953" inch with imperial units. The wheel has a width of 30mm=1.181" inch. The caster dimensions heightwise is 105mm/4.134" inch. Mounted via a Top Plate that has the size of 93mm x 62mm and the holes distance of 45mm x 72mm. The Double ball bearing design will enable the Thermoplastic Rubber tire to roll easily with a core made of Thermoplastic Rubber. Each caster will carry the load of 176 lb and is Rigid type. Last and not least the temperature range = -40 to 180 F. Remember, you will have to buy the 3inch-Caster-012 in order to have it :).