This is the tool I use to set lines for punching stitch holes. It is really nice for following borders of more complex shapes. This wing tool is also great for setting detail/accent lines around borders
The nuts on the wings are steel. Washers are of steel. The points are carefully hardened and every care is taken with the threads of the screws, which hold the legs in position on the wings. The springs are carefully tempered and are made for easy adjustment while holding the legs firmly. Made to U.S. Government Specifications. Forged steel. Fully polished.