The 1144 set is supplied in an attractive styrofoam box which includes: The cutter (assembled with 1/2″ ball bearing), three additional ball bearings of different sizes, their matching washers and an allen key. The different ball bearings enable you to perform rabbets of different depths. Please make sure to assemble the required ball bearing with its matching washer. The raised inner circle of the raised washers should always be pointed towards the ball bearing to enable its rotation.