Spiral Miter Gear, Bore Diameter 6 mm, Bore Diameter Tolerance 0.1 mm, Bore Type Plain, Face Width 5 mm, Finish Black Oxide, For Shaft Angle 90 Degrees , Gear Shape B3, Hub Diameter 16 mm, Hub Projection 8 mm, Material Carbon Steel, Material Grade S45C, Maximum Teeth Hardness 60 HRC, Metric Module Pitch 1, Minimum Teeth Hardness 50 HRC