You need 6inch-Lock-Swivel-Caster-014 to have your office desk, equipment or even a machine to easily roll them around. This caster is rolled on a wheel that has 150mm diameter/5.906" inch inches. The wheel has a width of 53mm=2.087" inch. The caster dimensions heightwise is 195mm/7.677" inch. This wheel caster can be mounted using a Top Plate with the dimensions of 100mm x 115mm and holes distance of 75mm x 85mm. The caster core is made of Polypropylene core and Rubber and has a Polypropylene core and Rubber tire with a low friction Double ball beaing. Here come the maximum load that should be applied on every wheel, remember to add safety factor, when calculating the load capacity 551 lb with a Swivel and Center Locking type. The temperature range is -40 to 180 F. Remember, you will have to buy the 6inch-Lock-Swivel-Caster-014 in order to have it :).