Tens of thousands of different kinds to select from to have your office Desk/chair sliding easily right and left, install the VXB20040BPP2B1. And rolling on wheel that has 40mm diameter/1.575" inch. The thickness of the wheel is 40mm or 1.575" inch. Overall height of the wheel caster is 50mm = 1.969" inch. This wheel caster can be mounted using a Top Plate with the dimensions of 38mm x 38mm and holes distance of 129mm x 74mm. The weehl core material is Polypropylene and has a Polypropylene tire with a low friction Roller bearing. Maximum load calpacity that should not be exceeded on each wheel, remember to add safety factor, when calculating the load capacity 55 lb with a Swivel and Center Brake type. The caster temperature range = -40 to 180 F. Buy our VXB20040BPP2B1, we wish all the best.