Mounting the 40mm-Lock-Swivel-Caster-005 Wheel Caster can make your life easier, push or pull your new project on wheels. 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 overall height of the caster is 50mm or 1.969" inch. This wheel caster can be mounted using a Top Plate with the dimensions of 38mm x 38mm and holes distance of 129mm x 74mm. The caster core is made of Polypropylene and has a Polypropylene tire with a low friction Roller bearing. Here come the maximum load that should be applied on every wheel, remember to add safety factor, when calculating the load capacity 55 lb with a Swivel and Center Locking type. Temperature range = -40 to 180 F. Enjoy our 40mm-Lock-Swivel-Caster-005, we wish all the best in your project.