Originally Posted by ssnare
sewing tool
It is a pattern - tracing tool. You place paper underneath an original pattern and then run this tool on the line that you want to trace. It will prick through the original pattern and leave little pricks in the paper underneath. You then cut out the pattern along the little pin - pricks on the underside paper. It is particularly useful if you have a multi - size pattern that you want to re - use in the different sizes and you don't have to spend time tracing the pattern and then cutting it out.