How to Say "wrenches" in Spanish
The Spanish word for “wrenches” is “llaves” — B1 level.
English → SpanishB1
nounB1
tools for gripping and turning

Examples
Necesito un juego de llaves para apretar estos tornillos.
I need a set of wrenches to tighten these screws.
Las llaves de paso del agua están en el sótano.
The water valves (or main stopcocks) are in the basement.
Se dañó una de las llaves que controlan el gas.
One of the valves that control the gas got damaged.
Specific Tools
When talking about tools, 'llaves' often needs an adjective to specify the type, like 'llaves inglesas' (adjustable wrenches) or 'llaves Allen' (Allen keys).
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