You need 3inch-Swivel-Caster-021 to have your office desk, equipment or even a machine to easily roll them around. 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 49mm (1.929" inch). The overall height of the caster is 101mm or 3.976" inch. Mounted via a Top Plate that has the size of 92mm x 65mm and the holes distance of 73mm x 45mm. The caster core is made of Nylon and has a Nylon tire with a low friction Ball bearing. Bearing in mind that every caster wheel has the load capacity of 441 lb with a Swivel type. The temperature range is -40 to 180 F. Enjoy our 3inch-Swivel-Caster-021, we wish all the best in your project.