Minimization of possible untoward effects on operator by installing VXB005100CPUB1 just ask your operator to push and pull, but not carry. The wheel diameter is 100mm or 3.937" inch in inches. The thickness of the wheel is 50mm or 1.969" inch. The Caster with the wheel from end to end is 145mm = 5.709" inch. Top Plate is the method of installing the caster to your equipment, here are the dimensions 100mm x 115mm with the holes distance of 75mm x 85mm. The weehl core material is Iron core and Polyurethane and has a Iron core and Polyurethane tire with a low friction Double ball beaing. Bearing in mind that every caster wheel has the load capacity of 705 lb with a Swivel and Center Brake type. The caster temperature range = -40 to 180 F. Very important notice, you need to buy the VXB005100CPUB1 in order to get one :).