Whatever you are building needed to be on wheels, here come the 3inch-Caster-021. This wheel caster has a wheel diameter of 75mm or 2.953" inch in inches. The wheel has a width of 40mm=1.575" inch. The overall height of the caster is 195mm or 7.677" inch. Mounted via a Top Plate that has the size of 110mm x 100mm x 4mm fork:3.5mm and the holes distance of 85mm x 75mm. The ball bearing design will enable the Polypropylene tire to roll easily with a core made of Polypropylene. Here come the maximum load that should be applied on every wheel, remember to add safety factor, when calculating the load capacity 441 lb with a type. Last and not least the temperature range = -40 to 180 F. Enjoy our 3inch-Caster-021, we wish all the best in your project.