Creaser

Creas"er (kr?s"?r), n. 1. A tool, or a sewing-machine attachment, for making lines or creases on leather or cloth, as guides to sew by.

2. A tool for making creases or beads, as in sheet iron, or for rounding small tubes.

3. (Bookbinding) A tool for making the band impression distinct on the back. Knight.