Stainless steel, 5 inch (125mm) Twin Wall Adjustable Wall Bracket 50-80mm Twist and lock twin wall flue systems tested to EN1856-1 T600 N1 D V2 L50050 G50. Adjustable wall bracket to secure the flue to the wall. Adjustable between 50mm and 80mm. Offers lateral support only. Use every 3000 mm As new, over ordered, surplus to requirements.