The control devices ø2.5mm can be fixed in any position on panels of 1 to 6mm thickness. We recommend minimum fixing centres of 30mm x 40mm. However, the dimensions and configuration should be decided on the basis of the applications. The actuators and lenses assemblies lock on to the holding bracket, tightened equally from the rear. The screw should be tightened adequately to such an extent as to pierce through the paint on the panel from inside. These screws also ensure the earthing of the unit.