You need 8inch-Swivel-Caster-028 to have your office desk, equipment or even a machine to easily roll them around. Diameter of the caster wheel is a metric standard 200mm that is equal to 7.874" inch with imperial units. The wheel has a width of 50mm=1.969" inch. The overall height of the caster is 240mm or 9.449" inch. Top Plate is the method of installing the caster to your equipment, the dimensions are 100mm x 115mm with the holes distance of 75mm x 85mm. The caster core is made of Black Cast iron and has a Black Cast iron tire with a low friction Roller bearing. Each caster will carry the load of 661 lb and is Swivel type. The temperature range is -40 to 180 F. Enjoy our 8inch-Swivel-Caster-028, we wish all the best in your project.