M2B20 Ametric Metric Minimum Plain Bore Steel Spur Gear with Hub, 2 Metric Module Tooth Profile, 20 Teeth, 20 Degree Pressure Angle, 44 mm Outside Diameter, 30 mm Hub Diameter, 10-12 +/-1mm Pilot Bore, 20 mm Tooth Face Width, (Mfg Code 1-025)