Break Corner/Corner-Trim The Break Corner/Corner-Trim tool cuts or adds material to a folded sheet metal part on an edge or a face. 1. External corner: cut material 2. Internal corner: add material Contents Creating a Break Corner Break Corner/Corner-Trim PropertyManager Creating a Corner Trim The Corner-Trim tool cuts or adds material to flattened sheet metal parts on an edge or a face. Parent topicUsing Sheet Metal Tools