Spiral Miter Gear Bore Diameter 10 mm Bore Diameter Tolerance +/- 0.2 mm Bore Type Plain Face Width 9 mm Finish Black Oxide For Shaft Angle 90 Degrees Gear Shape B3 Hub Diameter 30 mm Hub Projection 11.5 mm Material Carbon Steel Material Grade S45C Maximum Teeth Hardness 60 HRC Metric Module Pitch 1.5 Minimum Teeth Hardness 50 HRC