You need 4inch-Lock-Swivel-Caster-027 to have your office desk, equipment or even a machine to easily roll them around. This wheel caster has a wheel diameter of 100mm or 3.937" inch in inches. The thickness of the wheel is 50mm or 1.969" inch. The Caster with the wheel from end to end is 142mm = 5.591" inch. Mounted via a Top Plate that has the size of 100mm x 115mm and the holes distance of 75mm x 85mm. The caster core is made of Black Cast iron and has a Black Cast iron tire with a low friction Roller bearing. Bearing in mind that every caster wheel has the load capacity of 441 lb with a Swivel and Center Locking type. Temperature range = -40 to 180 F. Enjoy our 4inch-Lock-Swivel-Caster-027, we wish all the best in your project.