金こん剛ごう砂しゃ

noun

emery; emery powder

A hard abrasive powder used for grinding, polishing, or cutting. Often used in industrial or craft contexts.

• 金こん剛ごう砂しゃを使つかって金きん属ぞくの表ひょう面めんを磨みがく。

  Polish the metal surface using emery powder.