Spur Gear Metric Module Pitch 0.5 Bore Diameter 5 mm Bore Type Plain Hub Type Hub with Set Screws Hub Diameter 13.5 mm Hub Projection 11 mm Face Width 5 mm Pitch Diameter 12.5 mm Finish Black Oxide Material Carbon Steel Pressure Angle 20 Degrees Bore Diameter Tolerance H7 Gear Shape S3T Includes Set Screw