ROBUST AND TORSION RESISTANT.?USER BENEFITS:Robust and torsion-resistant 2-column guide for highest precision.Hardened and ground interchangeable collet chuck for precise concentricity of tools.Spindle lock for easy router bit change.Metabo Marathon-motor with patented dust protection for long service life.Vario-Constamatic (VC)-Full wave electronics for working at customised speeds to suit the application materials, and speeds that remain almost constant even under load.Thumbwheel for Speed Preselection.Restart protection: prevents unintentional start-up after power supply interruption.Electronic safety shutdown of the motor for safe working in case the tool stops unexpectedly.Aluminium die cast base plate with coating for easy sliding.Auto-stop carbon brushes to protect the motor.Can also be used on the guide track using an intermediate plate (accessory).Bayonet fitting of the motor in milling attachment; suitable for use with flexible shafts.Extraction possibility by means of connecting an all-purpose vacuum cleaner.