Trend 342 x 1/4 TCT Bearing Guided Biscuit Jointer 4.0 x 40mm342 Biscuit jointer set enables biscuit jointing with timber, man made fibre and particle board with the router. The set includes three sizes of bearing to suit biscuits available. The correct choice of bearing for the biscuit being used will ensure the correct depth of cut. A step washer is supplied for use with bearings Ref B15, and B23. A slightly wider cut than the width of the biscuit is required to allow some lateral play for easy alignment