Käteviksi
Käteviksi is the translative plural form of the Finnish adjective kätevä, typically translated as handy, convenient, or skilled in handling. In Finnish, the translative case marks a change of state or a designation of something as belonging to a certain state; the suffix -ksi (in the plural form -iksi) is used with adjectives as a predicative complement. Therefore käteviksi means “into the state of being handy” for multiple subjects.
Usage of käteviksi occurs when describing a transformation into a handy or convenient state for several things
Grammatically, käteviksi is used after verbs that express becoming, such as tulla or muuttua, and it agrees
In contrast, the singular form käteväksi is used with a singular subject or when referring to one