Imagine your office chair has no wheel caster, you would be carrying it right and left, install 6inch-Lock-Swivel-Caster-012 instead. This caster is rolled on a wheel that has 150mm diameter/5.906" inch inches. Dimensions of the caster wheel is 40mm (1.575" inch). The caster dimensions heightwise is 195mm/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 caster core is made of Polyurethane and Polypropylene and has a Polyurethane and Polypropylene tire with a low friction ball bearing. Each caster will carry the load of 772 lb and is Swivel and Upper Locking type. Last and not least the temperature range = -40 to 180 F. Remember, you will have to buy the 6inch-Lock-Swivel-Caster-012 in order to have it :).