Minimization of possible untoward effects on operator by installing VXB004125PHB just ask your operator to push and pull, but not carry. And rolling on wheel that has 125mm diameter/4.921" inch. Dimensions of the caster wheel is 30mm (1.181" inch). The Caster with the wheel from end to end is 155mm = 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 Double ball bearing design will enable the Phenolic and 0-250ºC tire to roll easily with a core made of Phenolic and 0-250ºC. Maximum load calpacity that should not be exceeded on each wheel, remember to add safety factor, when calculating the load capacity 220 lb with a Swivel and Upper Brake type. Environment temperature range is -40 to 180 F. Very important notice, you need to buy the VXB004125PHB in order to get one :).