Don't think too much, use 6inch-Lock-Swivel-Caster-021 to get your DIY move and manuver around. This caster is rolled on a wheel that has 150mm diameter/5.906" inch inches. Dimensions of the caster wheel is 40mm (1.575" inch). The caster dimensions heightwise is 195mm/7.677" inch. Top Plate is the method of installing the caster to your equipment, the dimensions are 110mm x 100mm x 4mm fork:3.5mm with the holes distance of 85mm x 75mm. Low drag was achieved by a Polyurethane and Polypropylene core on a Polyurethane and Polypropylene tire spinning freely with a ball bearing. Each caster will carry the load of 772 lb and is Swivel and Upper Locking type. Last and not least the temperature range = -40 to 180 F. Remember, you will have to buy the 6inch-Lock-Swivel-Caster-021 in order to have it :).