What is the function of the gerund in Roland's best skill is hammering nails with accuracy and force?

In the sentence "Roland's best skill is hammering nails with accuracy and force," the gerund "hammering" functions as a noun, specifically the subject complement. It describes the specific skill that Roland possesses, effectively identifying what his best skill entails. The gerund phrase "hammering nails with accuracy and force" elaborates on the nature of that skill.