Ratchet Gear Bore Diameter 15 mm Bore Diameter Tolerance +/- 0.2 mm Bore Type Plain Center Distance 72.28 mm Face Width 15 mm Finish Black Oxide Gear Shape T4 Material Carbon Steel Maximum Teeth Hardness 60 HRC Metric Module Pitch 6.28 Minimum Teeth Hardness 50 HRC Mounting Distance 46.9 mm Number of Teeth 50 Outside Diameter 100 mm