The Milescraft 1201 Base Plate / Bushing Set for Routers, featuring TurnLock Technology, will be the last Base Plate you ever install on your router. Featuring fast toolless guide bushing and router attachment exchanges router projects just got a little faster and a whole lot easier. Install the base plate once using the included centering pin and you will be able to exchange guide bushings in seconds. Great for template and jointing applications. Just as easy as changing the guide bushings, the TurnLock Offset Base and Circle/Edge Guide can be attached to and removed from the Base Plate in seconds as well. Kit includes a top had adaptor to convert your standard metal bushings into TurnLock Quick Change Bushings. Includes common size outside diameter bushings: 5/16-Inch, 3/8-Inch, 7/16-Inch, 7/16-Inch extended nose, 1/2-Inch, 5/8-Inch, 5/8-Inch extended nose, and 51/64-Inch.