Heavy weight capability and Durability made the wheel casters like the VXB20040BPP2T a must use, get your do it yourself object move around. Diameter size of the caster wheel has a metric standard 40mm which is equal to 1.575" inch with imperial units. Dimensions of the caster wheel is 40mm (1.575" inch). Overall height of the wheel caster is 38mm = 1.496" inch. This wheel caster can be mounted using a with the dimensions of 38mm x 38mm and holes distance of 129mm x 74mm. The Roller bearing design will enable the Polypropylene tire to roll easily with a core made of Polypropylene. Bearing in mind that every caster wheel has the load capacity of 55 lb with a Swivel type. Temperature range is -40 to 180 F. Very important notice, you need to buy the VXB20040BPP2T in order to get one :).