A business card explaining how to avoid splitting wood when driving a nail close to the edge of a board. These cards are part of a larger project sharing useful information with other people.
I had an initial run of 500 cards printed. When they run out, I'll order more.
Front of the card showing two nails, one with a sharp tip and the other with a dull tip, with the corresponding holes they would each make in a board.
Back of the card explaining how to prevent split wood.