Here are the measurements for a shutter card. (also called a step card)
You start with a piece of paper that is 12 inches long and 5 1/2 inches wide. Make a 5 1/2 score line (from top to bottom) at 2, 4, 8, & 10 inches from the left side of the card. Between the 2 inch and 10 inch score lines, make an 8 inch cut line 1 1/2 inches from the top of the card. Repeat this cut line 1 1/2 inches from the bottom of the card.
Refer to pictures to see how to fold.
You are welcome to the cut files, but NOTE:
The finished card is 12 inches long. You will need to resize the image so it will fit on the page. These are just the cut lines. You will need to score the card by hand.
Measurements and info: PDF