5inch-Swivel-Caster-051 is a wheel caster, which is the shortcut of installing wheels on a hospital bed, or any objexct needed to be moved. This caster is rolled on a wheel that has 125mm diameter/4.921" inch inches. Dimensions of the caster wheel is 50mm (1.969" inch). The caster dimensions heightwise is 166mm/6.535" inch. This wheel caster can be mounted using a Top Plate with the dimensions of 115mm x 100mm x 5.5mm and holes distance of 72mm x 85mm. The caster core is made of Cast Iron and has a Cast Iron tire with a low friction Roller bearing. Each caster will carry the load of 617 lb and is Swivel type. Temperature range = -40 to 180 F. Remember, you will have to buy the 5inch-Swivel-Caster-051 in order to have it :).