Kaufhof KWY162 4 Inch Flange Port For Wood Shop Dust Collection Excellent choice for locations where a smaller, rectangular dust hood is needed Dimensions: 9.5 inch x 4.5 inch | Create a cleaner shop and air with healthier work environment Predrilled holes for easy attachment | Connects to a 4 inch hose Use hose clamp for secure connection (available separately) Fits in router tables, band saws and other machinery