5/8" Inch Ball Bearing with 3/8" diameter integrated 3/8" Inch (9.53mm) Pin Diameter 3/8" x 5/8" x 1 1/4" Inch One Bearing 5/8" inch (15.88mm) Ball Bearing with 3/8" inch (9.53mm) diameter integrated 1 1/4" inch (25.4mm) Long Axle, Bearing is made of Chrome Steel, Pin Diameter is 3/8" inch, Bearing Outer diameter is 5/8" Inch (15.88mm), and Width of the assembly is 1 1/4" Inch (31.75mm Long).