ITEM NAME:Billet CNC Aluminum Turbo Oil Drain Return Flange 10AN GT25 GT28 GT30 GT35 40MM img *{margin:0;padding:0;.10AN fitting on it. - 40mm central bolt to bolt. - Billet Aluminum. Aluminum flanges features a heavy thick base that will not distort or Leak. - 2 x M8 bolt with spring washer.