Minimization of possible untoward effects on operator by installing VXB007040P just ask your operator to push and pull, but not carry. The wheel diameter is 40mm or 1.575" inch in inches. The wheel has a width of 17mm=.669" inch. The Caster with the wheel from end to end is 54mm = 2.126" inch. Mounted via a Top Plate that has the size of 45mm x 40mm and the holes distance of 35mm x 28.5mm. The Delrin bearing design will enable the Plastic tire to roll easily with a core made of Plastic. 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 type. Temperature range is -40 to 180 F. Very important notice, you need to buy the VXB007040P in order to get one :).