11/16" Inch Ball Bearing with 1/4" diameter integrated 1/4" Inch (6.35mm) Pin Diameter 1/4" x 11/16" x 9/16" Inch One Bearing 11/16" inch (17.5mm) Ball Bearing with 1/4" inch (6.35mm) diameter integrated 9/16" inch (14.3mm) Long Axle, Bearing is made of Chrome Steel, Pin Diameter is 1/4" inch, Bearing Outer diameter is 11/16" Inch (17.5mm), and Width of the assembly is 9/16" Inch (14.3mm Long).