3/4" Inch Ball Bearing with 3/8" diameter integrated 3/8" Inch (9.53mm) Pin Diameter 3/8" x 3/4" x 1" Inch 3/4" inch (19.05mm) Ball Bearing with 3/8" inch (9.53mm) diameter integrated 1" inch (25.4mm) Long Axle, Pin Diameter is 3/8" inch, Bearing Outer diameter is 3/4" Inch (19.05mm), and Width of the assembly is 1" Inch (25.4mm Long), Bearing is made of Chrome Steel.