Don't think too much, use 40mm-Lock-Swivel-Caster-009 to get your DIY move and manuver around. Diameter of the caster wheel is a metric standard 40mm that is equal to 1.575" inch with imperial units. The wheel has a width of 40mm=1.575" inch. The Caster with the wheel from end to end is 55mm = 2.165" inch. Top Plate is the method of installing the caster to your equipment, the dimensions are 34mm x 34mm with the holes distance of 129mm x 74mm. The caster core is made of Nylon and has a Nylon tire with a low friction Roller bearing. Each caster will carry the load of 55 lb and is Swivel and Upper Locking type. The temperature range is -40 to 180 F. Remember, you will have to buy the 40mm-Lock-Swivel-Caster-009 in order to have it :).