Don't think too much, use 8inch-Lock-Swivel-Caster-009 to get your DIY move and manuver around. This caster is rolled on a wheel that has 200mm diameter/7.874" inch inches. The thickness of the wheel is 50mm or 1.969" inch. The Caster with the wheel from end to end is 250mm = 9.843" inch. Mounted via a Top Plate that has the size of 115mm x 100mm x 6mm and the holes distance of 72mm x 85mm. Low drag was achieved by a Cast Iron and Polyurethane core on a Cast Iron and Polyurethane tire spinning freely with a Roller bearing. Here come the maximum load that should be applied on every wheel, remember to add safety factor, when calculating the load capacity 1190 lb with a Swivel and Upper Locking type. The temperature range is -40 to 180 F. Enjoy our 8inch-Lock-Swivel-Caster-009, we wish all the best in your project.