Minimization of possible untoward effects on operator by installing VXB20050NYGB just ask your operator to push and pull, but not carry. And rolling on wheel that has 50mm diameter/1.969" inch. The thickness of the wheel is 50mm or 1.969" inch. The Caster with the wheel from end to end is 48mm = 1.890" inch. is the method of installing the caster to your equipment, here are the dimensions 34mm x 34mm with the holes distance of 129mm x 74mm. The weehl core material is Nylon and has a Nylon tire with a low friction Roller bearing. Bearing in mind that every caster wheel has the load capacity of 66 lb with a Swivel and Upper Brake type. Environment temperature range is -40 to 180 F. Buy our VXB20050NYGB, we wish all the best.