Mounting the 4inch-Lock-Swivel-Caster-007 Wheel Caster can make your life easier, push or pull your new project on wheels. This caster is rolled on a wheel that has 100mm diameter/3.937" inch inches. The wheel has a width of 50mm=1.969" inch. The Caster with the wheel from end to end 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. The caster core is made of Polypropylene core and Polyurethane and has a Polypropylene core and Polyurethane tire with a low friction Double ball beaing. Bearing in mind that every caster wheel has the load capacity of 441 lb with a Swivel and Center Locking type. The temperature range is -40 to 180 F. Enjoy our 4inch-Lock-Swivel-Caster-007, we wish all the best in your project.