Worm Wheel Bore Diameter 8 mm Bore Diameter Tolerance +/- 0.2 mm Bore Type Plain Face Width 12 mm Gear Shape H1 Hub Diameter 22 mm Hub Projection 10 mm Material Bronze Metric Module Pitch 1.5 Number of Starts 1 Number of Teeth 20 Outside Diameter 34.5 mm Overall Length 22 mm