●This is a MicrOHERO 1-1/8 inch (30 mm) ball pusher ●It will be a 1-1/8 (30mm) column of OS ●Size: Outer Diameter: Approx. 1.6 inches (40.0 mm); Inner Diameter: Approx. 1.2 inches (30.0 mm); Thickness: Approx. 0.1 inches (3.9 mm) ●Material: Aluminum alloy 6061/T6; Compatible bearings: 1.6 - 1.7 inches (40 - 42 mm x 45 degrees) ●Manual and package not included