Whatever you are building needed to be on wheels, here come the 3inch-Lock-Swivel-Caster-012. This caster is rolled on a wheel that has 75mm diameter/2.953" inch inches. The wheel has a width of 50mm=1.969" inch. The overall height of the caster is 110mm or 4.331" inch. This wheel caster can be mounted using a Top Plate with the dimensions of 100mm x 115mm and holes distance of 75mm x 85mm. Low drag was achieved by a Polyurethane and Iron core on a Polyurethane and Iron tire spinning freely with a Ball bearing. Each caster will carry the load of 1102 lb and is Swivel and Upper Locking type. Last and not least the temperature range = -40 to 180 F. Remember, you will have to buy the 3inch-Lock-Swivel-Caster-012 in order to have it :).