Minimization of possible untoward effects on operator by installing VXB007050RBB2 just ask your operator to push and pull, but not carry. Diameter size of the caster wheel has a metric standard 50mm which is equal to 1.969" inch with imperial units. The wheel has a width of 16mm=.630" inch. Overall height of the wheel caster is 72mm = 2.835" inch. This wheel caster can be mounted using a Top Plate with the dimensions of 50mm x 50mm and holes distance of 36mm x 36mm. Low drag was achieved by a Grey rubber core on a Grey rubber tire spinning freely with a Plain bearing. Maximum load calpacity that should not be exceeded on each wheel, remember to add safety factor, when calculating the load capacity 44 lb with a Swivel and Upper Brake type. Temperature range is -40 to 180 F. Very important notice, you need to buy the VXB007050RBB2 in order to get one :).