Don't think too much, use 3inch-Lock-Swivel-Caster-015 to get your DIY move and manuver around. This wheel caster has a wheel diameter of 75mm or 2.953" inch in inches. The wheel has a width of 30mm=1.181" inch. The Caster with the wheel from end to end is 105mm = 4.134" inch. Top Plate is the method of installing the caster to your equipment, the dimensions are 93mm x 62mm with the holes distance of 45mm x 72mm. Low drag was achieved by a Thermoplastic Rubber core on a Thermoplastic Rubber tire spinning freely with a Double ball bearing. Here come the maximum load that should be applied on every wheel, remember to add safety factor, when calculating the load capacity 176 lb with a Swivel and Upper Locking type. Temperature range = -40 to 180 F. Enjoy our 3inch-Lock-Swivel-Caster-015, we wish all the best in your project.