Wheel casters like the 5inch-Lock-Swivel-Caster-019 are used to roll your built machine or equipment back and forth. This wheel caster has a wheel diameter of 125mm or 4.921" inch in inches. Dimensions of the caster wheel is 50mm (1.969" inch). The Caster with the wheel from end to end is 195mm = 7.677" inch. This wheel caster can be mounted using a Top Plate with the dimensions of 138mm x 110mm x 10mm and holes distance of 110mm x 75mm. The caster core is made of Cast iron polyurethane and has a Cast iron polyurethane tire with a low friction Precision double ball bearing. Each caster will carry the load of 882 lb and is Swivel and Upper Locking type. Temperature range = -40 to 180 F. Remember, you will have to buy the 5inch-Lock-Swivel-Caster-019 in order to have it :).