There are some places a fly swatter does not reach well, like a narrow space between two objects or on the corner of a table. Sometimes you wish to kill a fly that seldom lands on something. When it does light, it may settle on something where a swatter is really not an option. For times like those a surgically precise strike with a rubber band fly killer is ideal.
Pictured is a fly that settled on the side or a vertical roll of paper towels located on a table in a restaurant as napkins. I probably would not kill a fly in a restaurant, but a fly swatter would not have worked well in this situation. Chances are, the swat would have knocked over the roll of paper towels, which would have knocked over other things on the table and made a big mess. But, a rubber band fly killer would have made the job easy, quick, and precise.
Step 1: What bands to use
Two #64 rubber bands (1/4 x 3 1/2 inches) are ideal, although similar 1/8 inch sizes will also work well.