41 B 12 Tooth Sprocket 20MM ID, 6mm Keyway and two set screws

41 B 12 Tooth 20MM ID, with 6mm Keyway and two set screws.

Be sure and order the 6 mm x 6 mm x 20 mm long with Rounded ends, Metric Sq. Key.  #4304

Used with some electric motors / 20mm OD shafts / axle.  20mm ID.