style of stitching groover where the cutting hole is made in a thin length of square steel, then bent into an L shape
The handle is attached to a collet that protrudes straight out with a tubular guide. Fastening the cutter bar in the collet holds it out from the guide and handle at a ninety-degree angle.
Contrast pen-style stitching groover, which holds the cutter straight out from the haft and the guide to the side.