You need 6inch-Swivel-Caster-019 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. The thickness of the wheel is 50mm or 1.969" inch. The overall height of the caster is 195mm or 7.677" 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. Rolling with a wheel core material of Thermoplastic Rubber and a Thermoplastic Rubber tire rolled over Double ball beaing. Bearing in mind that every caster wheel has the load capacity of 617 lb with a Swivel type. Last and not least the temperature range = -40 to 180 F. Remember, you will have to buy the 6inch-Swivel-Caster-019 in order to have it :).