Abstract: A flanging tool used with an impact tool to attach a vehicular door panel to a door frame is disclosed. The flanging tool has a connecting end and a crimping end with means attached to the connecting end for connecting the shank to the impact tool. A hook is mounted with the crimping end of the shank for folding a door panel edge over and crimping the edge to the door frame lip. The hook has a flared lip to aid in folding the edge over the lip and a crimping portion to force the panel edge against the door frame lip. The crimping portion is of generally U-shaped cross-section with one side of the "U" extending into the shank and the other side of the "U" extending into the flared end which generally curves outwardly from the shank side. The folding and crimping of the edge to the door frame lip is accomplished by use of the impact tool.