4inch-Lock-Caster-005 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 100mm diameter/3.937" inch inches. The wheel has a width of 50mm=1.969" inch. The overall height of the caster is 142mm or 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. Rolling with a wheel core material of Rubber and a Rubber tire rolled over Roller bearing. Bearing in mind that every caster wheel has the load capacity of 441 lb with a Side Locking type. The temperature range is -40 to 180 F. Remember, you will have to buy the 4inch-Lock-Caster-005 in order to have it :).