How should the mirror arm and casing be described during a pre-trip check?

During a pre-trip inspection, it is essential to ensure that the mirror arm and casing are present, secure, and not damaged. This description is crucial because the mirrors play a vital role in ensuring safe driving by providing the driver with necessary visibility of the surrounding environment. If the mirror arm is loose or damaged, it could result in poor visibility or misaligned mirrors, potentially leading to hazardous driving conditions.

While other attributes might be related to aesthetics or additional features of the mirrors, such as being shiny or reflective, the primary concern during a safety inspection is their condition and secure attachment to the vehicle. Ensuring the mirrors are undamaged and firmly in place allows the driver to rely on them for clear visibility while driving, making this description the most relevant for a pre-trip check.