Imagine your office chair has no wheel caster, you would be carrying it right and left, install 5inch-Caster-037 instead. Diameter of the caster wheel is a metric standard 125mm that is equal to 4.921" inch with imperial units. The wheel has a width of 30mm=1.181" inch. The overall height of the caster is 155mm or 6.102" inch. This wheel caster can be mounted using a Top Plate with the dimensions of 93mm x 62mm and holes distance of 45mm x 72mm. The caster core is made of Polypropylene and has a Polypropylene tire with a low friction Double ball bearing. Here come the maximum load that should be applied on every wheel, remember to add safety factor, when calculating the load capacity 220 lb with a Rigid type. Temperature range = -40 to 180 F. Enjoy our 5inch-Caster-037, we wish all the best in your project.