Low cost solution to the heavy weight objects movement, Wheel casters like our VXB010200RBB are used to roll your machine or equipment back and forth. The wheel diameter is 200mm or 7.874" inch in inches. The wheel has a width of 50mm=1.969" inch. The Caster with the wheel from end to end is 250mm = 9.843" inch. is the method of installing the caster to your equipment, here are the dimensions 180mm x 145mm Top Plate: 12mm+housing: 10mm with the holes distance of 140mm x 105mm. Low drag was achieved by a Iron rim and and rubber core on a Iron rim and and rubber tire spinning freely with a Roller bearing. Each caster will carry the load of 551 lb and is Swivel and Upper Brake type. Temperature range is -40 to 180 F. Buy our VXB010200RBB, we wish all the best.