* The gerund phrase is "hammering nails with accuracy and force."
* Gerunds are verb forms ending in "-ing" that function as nouns. In this case, "hammering nails" is the noun representing the act of hammering.
* The entire phrase modifies the noun "skill" by describing the specific type of skill being discussed. It's similar to saying "the skill *of* hammering nails..."
Therefore, the function of the gerund phrase "hammering nails with accuracy and force" is to act as an adjective modifying the noun "skill," specifying the particular skill being referred to.