noun
monkey wrench; adjustable wrench; shifting spanner
A wrench with an adjustable jaw, used for gripping and turning nuts and bolts of various sizes.
モンキーレンチでナットを回した。
I turned the nut with a monkey wrench.
Variant with interpunct; less common but still used.
スパナ is a fixed-size spanner (open-end wrench), while モンキーレンチ is adjustable.
Loanword from English 'monkey wrench'.