Low cost solution to the heavy weight objects movement, Wheel casters like our VXB20040ALT-R are used to roll your machine or equipment back and forth. The wheel diameter is 40mm or 1.575" inch in inches. The thickness of the wheel is 40mm or 1.575" inch. The Caster with the wheel from end to end is 54mm = 2.13" inch. is the method of installing the caster to your equipment, here are the dimensions 47mm x 47mm with the holes distance of 129mm x 74mm. Low drag was achieved by a Acrylonitrile Butadiene Styrene (Plastic) core on a Acrylonitrile Butadiene Styrene (Plastic) tire spinning freely with a Roller bearing. Maximum load calpacity that should not be exceeded on each wheel, remember to add safety factor, when calculating the load capacity 55 lb with a Swivel type. Environment temperature range is -40 to 180 F. Very important notice, you need to buy the VXB20040ALT-R in order to get one :).