Imagine your office chair has no wheel caster, you would be carrying it right and left, install 51mm-Lock-Swivel-Caster-001 instead. This wheel caster has a wheel diameter of 51mm or 2.008" inch in inches. Dimensions of the caster wheel is 51mm (2.008" inch). The Caster with the wheel from end to end is 257mm = 10.118" inch. Mounted via a Top Plate that has the size of 47mm x 47mm and the holes distance of 129mm x 74mm. Low drag was achieved by a Acrylonitrile Butadiene Styrene (Plastic) core on a Acrylonitrile Butadiene Styrene (Plastic) 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 77 lb with a Swivel and Upper Locking type. The temperature range is -40 to 180 F. Enjoy our 51mm-Lock-Swivel-Caster-001, we wish all the best in your project.