This Dust Boot was specifically designed to work with the RTR line of routers. Its made to keep table dust to a minimum. It comes as two pieces, the bottom piece connects to the spindle cover via magnets and has a brush system to guide the dust into the vacuum. The top part is a vacuum hose adapter and it connects to the lower dust boot portion with magnets as well for easy removal. The dust boot is designed for a 2.5" hose but if you need a larger hose connection: message us and we'll see what we can do for you.