llave allen
/ˌuniðˈad ðe ðˌestilaθjˈon al βaθˈio/
n
English: valve seat wrench · 阀座扳手
Significado：Elbow-shaped key, usually having one square end and the other octagonal, used mainly for removing faucet seats.
English: valve seat wrench · 阀座扳手