609
Aluminium extrusions produced via an extrusion process, of alloys having metallic elements falling within the alloy designations published by The Aluminium Association commencing with 1, 2, 3, 5, 6 or 7 (or proprietary or other certifying body equivalents), with the finish being as extruded (mill), mechanical, anodized or painted or otherwise coated, whether or not worked, having a wall thickness or diameter greater than 0.5mm, with a maximum weight per metre of 27 kilograms and a profile or cross-section which fits within a circle having a diameter of 421mm.