3/8" inch (9.53mm) Flanged Ball Bearing with 1/8" inch (3.18mm) diameter integrated 3/8" inch (9.53mm) Long Axle, Bearing is made of Chrome Steel, Pin Diameter is 1/8" inch, Bearing Outer diameter is 3/8" Inch (9.53mm), and Width of the assembly is 3/8" Inch (9.53mm Long).