A leather ventilator punch is a metal tool that punches a group of round holes into leather material. They have a solid steel hitting end, and a cutting end with several, usually about 6, small, round punches mounted in a generally circular pattern.
Ventilator punches make it easy to punch multiple small, grouped holes in leather goods where airflow can be helpful. This is often seen in bags and cases where airflow can be helpful, and sometimes shoes.
If you’re looking for a ventilator punch it’s likely for a particular project, so ensure the hole size and cut pattern will match your needs. If so, these can surely help save time over manually measuring and punching individual holes.