Covers for Light and Indicator Switches to protect the contacts and for a clean look.
Light and Indicator Switches themselves are often still in good condition, but the plastic cover becomes brittle over time or is lost completely. This is not only a visual blemish, but also exposes sensitive electrical contacts - and thus the switch to dirt and the weather. Covers for Light and Indicator Switches are therefore available in plastic (black or chrome) and from the SIP STYLE line in stainless steel or polished aluminum. Quickly replaced - Switch protected.
Conclusion: Inexpensive replacement or small style detail.