Hardie 306102 9mm Aluminium External Slimline Corner 3000mmProduct code: 306102 A sleek aluminium external corner that prioritises design with a sharp, minimal edge. Cut the cladding panels at an angle or use the overlap shiplap joint for a surprising amount of coverage to assist installation. It suits 8. 5 9mm thick cladding panels. Tip: cut panels between 45 to 60 degrees angle for better adjustment.