HELLA built-in roller shutters are made of extruded, through-dyed plastic or roll-formed aluminium, foamed, with light and air slits. The curtain is locked and fixed to the shaft with rigid shaft connectors. The end bar is weighted with weighting irons. The built-in roller shutters can be used variably, as right-hand or left-hand roller shutters for external inspection or as right-hand roller shutters for internal inspection. The aluminium parts are powder-coated and the colour can be freely selected from the HELLA colour range.