Low cost solution to the heavy weight objects movement, Wheel casters like our VXB20040NYB are used to roll your machine or equipment back and forth. Diameter size of the caster wheel has a metric standard 40mm which is equal to 1.575" inch with imperial units. The wheel has a width of 40mm=1.575" inch. Overall height of the wheel caster is 55mm = 2.165" inch. Top Plate is the method of installing the caster to your equipment, here are the dimensions 34mm x 34mm with the holes distance of 129mm x 74mm. This caster wheel core material is Nylon and has a Nylon tire spinning over 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 and Upper Brake type. The caster temperature range = -40 to 180 F. Buy our VXB20040NYB, we wish all the best.