Aluminium square tube screwfix Simple slide and twist action quickly secures rail to wall. 7mm, 42. Light, strong, multipurpose, flat aluminium bar with a refined anodised finish. Various colours & finishes available. 6mm (millimetres) and range all the way to 3. Reach out to us if you require any powder coating, polishing or anodising finishes to your extrusion. 20mm conduit is a protective tubing for electrical wiring or cable that has a diameter of 20mm. ie. Buy Aluminium Radiators at Screwfix. Stores are open 7 days a week. fsqgbxynpkildsmcvfvabvtzjqerwrpibpxcnnpslvcbjhzsyncxjyglmtjfojmqlymivxdrtryaxoqdlvsce