When gluing a number of boards together you can use a glue joint bit to increase the amount of gluing surface. Tongue & Groove bits can be used for assembling broad tabletops, other panels, and making strip flooring. The bits are available individually or as a Two Piece Set and are intended to be used in a table-mounted router. The Fine Finger Joint bit allows you to make a strong end to end glue joint, which is ideal for joining particle and composition board as well as solid wood stock. The Multi-Side bit is a great way to join up multi-side projects such as planters, columns, barrels, etc. Notching only one edge of each side improves assembly and total glue area.