Worm Wheel Bore Diameter 12 mm Bore Diameter Tolerance +/- 0.2 mm Bore Type Plain Face Width 22 mm Gear Shape H1 Hub Diameter 35 mm Hub Projection 14 mm Material Bronze Metric Module Pitch 2.5 Number of Starts 2 Number of Teeth 20 Outside Diameter 57.5 mm Overall Length 36 mm