This base plate is pre-drilled to fit the Ridgid R2401 and Ridgid R86044 Palm Routers or the Ryobi P601 cordless trim router. It's designed to help wood sign carvers to maintain better control of the router for finer detail carving in graphics and text. Each base is laser cut from clear 1/4 inch cast acrylic so you get a clear view of what you're cutting or carving. Overall measurement is 5" x 7.5". The center hole is 1.75" in diameter for better visibility. NOTE: The oversized hole will NOT accept "template guides". Each base comes with the handles attached. You can see all the details on our YouTube video # 92. (channel oldave100) https://youtu.be/sjgBklw-8hs Our base plates are designed specifically for freehand carving wood signs. In most cases they are not made to work with factory made dust extraction ports.