Zinc-plated steel tool made in the USA. It comes with light-reflective tape to locate easily at night and a zip tie to hang near the gas meter. This tool fits 1/2 and 3/4 valves and is easy to use.
 
To shut off the gas, apply the tool to the valve and turn 1/4 of a turn.
When ready to restore the gas supply, contact the gas company, or a qualified plumber.