5/8" Inch Ball Bearing with 1/4" diameter integrated 1/4" Inch (6.35mm) Pin Diameter 1/4" x 5/8" x 9/16" Inch One Bearing 5/8" inch (15.88mm) Ball Bearing with 1/4" inch (6.35mm) diameter integrated 9/16" inch (14.29mm) Long Axle, Bearing is made of Chrome Steel, Pin Diameter is 1/4" inch, Bearing Outer diameter is 5/8" Inch (15.88mm), and Width of the assembly is 9/16" Inch (14.29mm Long).