POWERTEC 70169 Mini Gulp Dust Hood with 4" Port, 13-1/2" x 7-1/4" Easy solution for catching sawdust Can be placed behind, underneath or wherever is convenient Durable, long-lasting ABS plastic material construction Port attachment measures 4" Measured 13-1/2" x 7-1/4", flange 7/8" wide; Pre-drilled holes on flange