Module 2, 28 Tooth, Ground Carbon Steel Spur Gears. Bore Type : Finished, Module : 2, No. of teeth : 28, Shape : S1K, Bore (A) (mm) : 22.0, Hub Diameter (B) (mm) : 45.0, Pitch Diameter (C) (mm) : 56.00, Outer Diameter (D) (mm) : 60.00, Face Width (E) (mm) : 20.0, Hub Width (F) (mm) : 16.0, Total Length (G) (mm) : 36.00, Pressure Angle : 20°