Kaufhof KWY161 4 Inch Universal Dust Port / Adapter For Wood Shop Dust Collection Dimensions: Width 4.25 inch x Length 7.5 inch x Depth 3.75 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 | Fits router tables, band saws and other machinery Mounting Holes: 2x, 6.5 inch apart and hole size 13/64 inch