Don't think too much, use 8inch-Lock-Swivel-Caster-016 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 250mm = 9.843" inch. is the method of installing the caster to your equipment, the dimensions are 180mm x 145mm Top Plate: 12mm+housing: 10mm with the holes distance of 140mm x 105mm. The Roller bearing design will enable the Polyurethane rim and and PU tire to roll easily with a core made of Polyurethane rim and and PU. Bearing in mind that every caster wheel has the load capacity of 551 lb with a Swivel and Upper Locking type. Last and not least the temperature range = -40 to 180 F. Remember, you will have to buy the 8inch-Lock-Swivel-Caster-016 in order to have it :).