There are many types of metal flashlights available.
Large metal flashlights which use many batteries are common among law enforcement and police officers. Compact LED metal flashlights are very popular due to their low cost and long life. These are great to keep in your house or vehicle in case of an emergency situation.
Tactical metal flashlights used by the armed forces and SWAT teams are an integral part of their equipment.
Mechanics rely on metal flashlights when they are working underneath a vehicle.