2 Flute rabbeting bit with 4 ball bearings. Four different rabbet depths. Kit includes: 4 - bearings, hex key, washer and screw. (Replacement bearings sold separately).Bearing for 1/2" rabbet: Part # AM47702Bearing for 7/16" rabbet: Part # AM47706Bearing for 3/8" rabbet: Part # AM47718Bearing for 5/16" rabbet: Part # AM47720