Wheel casters like the 6inch-Lock-Swivel-Caster-007 are used to roll your built machine or equipment back and forth. This wheel caster has a wheel diameter of 150mm or 5.906" inch in inches. Dimensions of the caster wheel is 50mm (1.969" inch). The caster dimensions heightwise is 195mm/7.677" inch. This wheel caster can be mounted using a Top Plate with the dimensions of 100mm x 115mm and holes distance of 75mm x 85mm. The caster core is made of Polypropylene core and Polyurethane and has a Polypropylene core and Polyurethane tire with a low friction Double ball beaing. Each caster will carry the load of 617 lb and is Swivel and Center Locking type. Temperature range = -40 to 180 F. Remember, you will have to buy the 6inch-Lock-Swivel-Caster-007 in order to have it :).