| 18 inch Metal Ruler |
The bone folder is used to put a heavy crease on the folded edge of paper. So you fold by hand first and just use the bone folder to fix the edge.
When using the bone folder, hold it in a loosely gripped fist with fingernails lightly resting on the table with the bone folder resting on your fingertips and your thumb on the opposite side of the bone folder. You apply a downward pressure with your thumb and your fingernails will drag along the table surface next to the edge of the paper. The tapered end of the bone folder should be applied to the edge of the paper, don't dig into the paper, use the flat side to compress the fold.
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