33/64" inch (13.09mm) Ball Bearing with 1/4" inch (6.35mm) diameter integrated 9/16" inch (14.3mm) Long Axle, Pin Diameter is 1/4" inch, Bearing Outer diameter is 33/64" Inch (13.09mm), and Width of the assembly is 9/16" Inch (14.3mm Long), Bearing is made of Chrome Steel.