Leather craft screw creaser line drawing tool. The blade and blade width can be adjusted with screws, and it is a tool for drawing lines along the edge of leather. It is a tool for drawing stitching lines or decorative lines. When using a stitch tool or screw creaser, you can achieve a very beautiful finish. How to use: Adjust the width of the tip, align one side with the edge (koba), place the other side on the grain side, and pull towards you to create a groove.