Mounting 3inch-Caster-016 is the solution of making your project to move around by pushing. This caster is rolled on a wheel that has 75mm diameter/2.953" inch inches. The wheel has a width of 21mm=.827" inch. The Caster with the wheel from end to end is 93mm = 3.661" inch. Top Plate is the method of installing the caster to your equipment, the dimensions are 65mm x 54mm with the holes distance of 51mm x 38mm. Rolling with a wheel core material of Thermoplastic Rubber and a Thermoplastic Rubber tire rolled over Plain bearing. Here come the maximum load that should be applied on every wheel, remember to add safety factor, when calculating the load capacity 121 lb with a Fixed type. Temperature range = -40 to 180 F. Remember, you will have to buy the 3inch-Caster-016 in order to have it :).