Mounting VXB20040ALB is the Low cost solution of making a project to move around by pushing or pulling. The wheel diameter is 40mm or 1.575" inch in inches. The wheel has a width of 40mm=1.575" inch. The caster dimensions heightwise is 257mm/10.118" inch. Mounted via a Top Plate that has the size of 38mm x 38mm and the holes distance of 129mm x 74mm. The weehl core material is Acrylonitrile Butadiene Styrene (Plastic) and has a Acrylonitrile Butadiene Styrene (Plastic) tire with a low friction Roller bearing. Each caster will carry the load of 55 lb and is Swivel and Upper Brake type. The caster temperature range = -40 to 180 F. Very important notice, you need to buy the VXB20040ALB in order to get one :).