Ratchet Gear Bore Diameter 15 mm Bore Diameter Tolerance +/- 0.2 mm Bore Type Plain Center Distance 61.23 mm Face Width 15 mm Finish Black Oxide Gear Shape T9 Hub Diameter 50 mm Hub Projection 14 mm Material Carbon Steel Maximum Teeth Hardness 60 HRC Metric Module Pitch 6.28 Minimum Teeth Hardness 50 HRC Mounting Distance 26.9 mm Number of Teeth 30 Outside Diameter 60 mm