What are lugs on a drum?

Lugs on a drum are the components, usually metal, that connect the drumhead to the drum shell and provide tension for the drumhead . They typically consist of a tension rod, a washer, a lug nut, and a grommet. The tension rod is inserted through a hole in the drumhead and threaded into a lug nut. The washer sits between the lug nut and the drumhead, and the grommet sits between the lug nut and the drum shell. When the lug nut is tightened, the tension rod pulls the drumhead taut against the drum shell. This tension provides the drum with its pitch, and the lugs allow for adjustments to be made to the tension and tone of the drum.