Three common router attachments in one great kit. Cut circles and arcs from 10 to 51-Inch in diameter with the circle compass. Make straight cuts and slots up to 31-Inch from the board edge with the edge fence. Use the 13-Inch oblong offset base for stability for edge routing applications. Rigid 20-Inch aluminum beam is sturdy for inside and outside cuts. TurnLock Technology fits most routers without modification and allows tool free attachment and guide bushing exchanges.