7/8" Inch Ball Bearing with 3/8" diameter integrated 3/8" Inch (9.53mm) Pin Diameter 3/8" x 7/8" x 1 1/4" Inch 7/8" inch (22.23mm) Ball Bearing with 3/8" inch (9.53mm) diameter integrated 1 1/4" inch (31.75mm) Long Axle, Bearing Outer diameter is 7/8" Inch (22.23mm), Pin Diameter is 3/8" inch, and Width of the assembly is 1 1/4" Inch (31.75mm Long), Bearing is made of Chrome Steel.