welt embossing tool for marking lines radiating outward through the outseam stitch holes in the form of a chisel-like punch
often used to deepen impressions left by fudge wheels, and sometimes to change the shapes of the impressions from round to angled or square
Some seam detailers are chisel-shaped, having only one ridge or blade to leave an impression. Other details have two ridges spaced a set distance apart, to be placed spanning a stitch on the welt.