Which of the following is used to create reinforced drain holes in aircraft fabric?

Grommets are used to create reinforced drain holes in aircraft fabric because they provide a durable and effective means of protecting the fabric from fraying and tearing around the holes. When a grommet is installed, it creates a strong ring that strengthens the edges of the hole. This is particularly important in areas that may experience moisture accumulation, as it allows for effective drainage while ensuring the fabric remains intact and functional.

The chosen method not only reinforces the hole but also helps maintain the integrity of the structure, preventing potential damage to the fabric over time. It is crucial in aircraft covering practices where preventing moisture intrusion is vital for the longevity and safety of the aircraft. Other options, while useful in different contexts, do not specifically provide the same level of reinforcement for drain holes in the fabric.