Don't think too much, use 4inch-Swivel-Caster-021 to get your DIY move and manuver around. This wheel caster has a wheel diameter of 100mm or 3.937" inch in inches. The wheel has a width of 50mm=1.969" inch. The caster dimensions heightwise is 142mm/5.591" inch. Top Plate is the method of installing the caster to your equipment, the dimensions are 100mm x 115mm with the holes distance of 75mm x 85mm. Low drag was achieved by a Polypropylene core and Polyurethane core on a Polypropylene core and Polyurethane tire spinning freely with a Double ball beaing. Each caster will carry the load of 441 lb and is Swivel type. Temperature range = -40 to 180 F. Enjoy our 4inch-Swivel-Caster-021, we wish all the best in your project.