Wheel casters like the 8inch-Caster-024 are used to roll your built machine or equipment back and forth. This caster is rolled on a wheel that has 200mm diameter/7.874" inch inches. Dimensions of the caster wheel is 50mm (1.969" inch). The Caster with the wheel from end to end is 240mm = 9.449" 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 Polyvinyl Chloride and has a Polyvinyl Chloride tire with a low friction Double ball beaing. Each caster will carry the load of 661 lb and is Fixed type. The temperature range is -40 to 180 F. Remember, you will have to buy the 8inch-Caster-024 in order to have it :).