Don't think too much, use 8inch-Swivel-Caster-012 to get your DIY move and manuver around. This wheel caster has a wheel diameter of 200mm or 7.874" inch in 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. Rolling with a wheel core material of Stainless steel fork and Polyurethane and a Stainless steel fork and Polyurethane tire rolled over Double ball beaing. Each caster will carry the load of 661 lb and is Swivel type. Temperature range = -40 to 180 F. Remember, you will have to buy the 8inch-Swivel-Caster-012 in order to have it :).