Human-Machine Interface Front Fittings Aluminium front panels for perfect visual integration into the front of the Comfort-Panel and Optipanel operating housings. Front Fittings Cover plate for support arm connection Cover plates for round and rectangular support arm connections. Show products Front Fittings Front panel for Comfort Panel and Optipanel Aluminum, 3 mm. Show products Front Fittings Mounting kit for Comfort Panel For the installation of aluminum front panels, command panels and keyboards. Show products