Arbor for Engraving System 1/4″ shank.The Engraving Insert System features one tool body with 40 unique insert knives designed for a variety of applications: Straight cut, core box, round corner, V grooves and Chamfering. Industrial quality insert knives ensure clean cuts and a longer life time than the standard solid router bits. This engraving system was engineered to quickly interchange inserts while mounted in CNC machines to eliminate set up time and to maintain consistent cutting accuracy. Balanced design to minimize vibration and to provide superior cutting results. Ideal for cutting laminated materials, veneers, MDF, plastics, wood and solid surfaces.