Revovling Punch Pliers
The Revolving Punch Pliers by General Tools are ideal for making miniscule punch holes that would not be practical with a single-style punch.
The revolving turret offers six distinct punch sizes for use on leather, rubber, plastic and similar materials.
This tool is commonly used around the home for hobbies and crafts, or for adding additional holes to a leather belt.
The opening on this will not open wide enough for a 1/2" thick.
This item would probably work better for you: https://www.toolexperts.com/center-punch-aluminum-hardened-steel.html