työkalujensa
"Työkalujensa" is a Finnish word, a possessive plural form of the word "työkalu," which translates to "tool." The ending "-nsa" is a possessive suffix indicating "his/her/its/their." Therefore, "työkalujensa" literally means "his/her/its/their tools."
In Finnish grammar, this form is used when referring to the tools belonging to a third person
The word itself highlights the Finnish language's agglutinative nature, where suffixes are added to a root