Little or minimum effort can be possible on your operator by installing VXB009C300BFS just ask your operator to push and pull, but not carry. Spinning on wheel that has 300mm diameter/11.811" inch. Sizes of the caster wheel is 75mm (2.953" inch). The Caster with the wheel from end to end is 365mm = 14.370" inch. Mounted via a Top Plate that has a size of 200mm x 153mm Top Plate: 14mm+housing: 10mm and the holes distance of 160mm x 90mm. This caster wheel core made of Cast iron polyurethane and has a Cast iron polyurethane tire spinning over Precision double ball bearing. Having in mind that every caster wheel has the load capacity of 3307 lb with a Swivel type. The caster wheel temperature range = -40 to 180 F. FYI, you will need to buy the VXB009C300BFS in order to get one :).