3/4" Inch Ball Bearing with 1/2" diameter integrated 1/2" Inch (12.7mm) Pin Diameter 1/2" x 3/4" x 1 1/4" Inch 3/4" inch (19.05mm) Ball Bearing with 1/2" inch (12.7mm) diameter integrated 1 1/4" inch (31.75mm) Long Axle, Pin Diameter is 1/2" inch, Bearing Outer diameter is 3/4" Inch (19.05mm), and Width of the assembly is 1 1/4" Inch (31.75mm Long), Bearing is made of Chrome Steel.