This is the 17613th most frequent Polish word.
zestawów
"Zestawów" means "sets" (genitive plural form) in English.
In this sentence, 'zestawów' is used in the genitive plural form, referring to multiple sets of tools.
Sprzedawca pokazał mi kilka nowych zestawów narzędzi.
The seller showed me several new tool sets.
Here, 'zestawów' is applied to denote various building kits from the LEGO brand, highlighting the plural genitive case.
W sklepie było wiele zestawów LEGO dla dzieci.
There were many LEGO sets for children in the store.
In this context, 'zestawów' specifically conveys collections of data items, again in the genitive plural form.