You need 6inch-Caster-020 to have your office desk, equipment or even a machine to easily roll them around. This wheel caster has a wheel diameter of 150mm or 5.906" inch in inches. Dimensions of the caster wheel is 50mm (1.969" inch). The Caster with the wheel from end to end is 205mm = 8.071" inch. Mounted via a Top Plate that has the size of 138mm x 110mm x 10mm and the holes distance of 110mm x 75mm. Low drag was achieved by a Cast iron polyurethane core on a Cast iron polyurethane tire spinning freely with a Precision double ball bearing. Bearing in mind that every caster wheel has the load capacity of 992 lb with a Fixed type. The temperature range is -40 to 180 F. Enjoy our 6inch-Caster-020, we wish all the best in your project.