This is the 13088th most frequent Russian word.
мастерам
"To the masters" (dative plural form of "мастер").
In this sentence, 'мастерам' is used in the dative plural form of 'мастер', meaning craftsmen, indicating the indirect object in the context of giving them tools.
Мы дали мастерам все необходимые инструменты для завершения работы.
We gave the craftsmen all the necessary tools to complete the work.
Here, 'мастерам' again represents the dative plural form of 'мастер', used in the context of possession and description of characteristics.
У мастерам высокого уровня часто есть свои секреты мастерства.
High-level craftsmen often have their own craftsmanship secrets.
'Мастерам' in this phrase indicates the indirect object to which an action (heading towards) is oriented.