Spur Gear Metric Module Pitch 0.5 Bore Diameter 4 mm Bore Type Plain Hub Type Hub with Set Screws Hub Diameter 10 mm Hub Projection 11 mm Face Width 5 mm Pitch Diameter 9 mm Finish Black Oxide Material Carbon Steel Pressure Angle 20 Degrees Bore Diameter Tolerance H7 Gear Shape S3T Includes Set Screw