Specs -Air flow tuning via five pin options 0.8mm/1.0mm/1.2mm/ 1.5mm/1.8mm respectively, pinned inside a D=4.0mm nest, plus through five air flow tubes 2.0mm/2.5mm/3.0mm/3.5mm/4.0mm. No tube for a perfect airy 5.0mm DL -M2.5mm pan head phill...