Diagram of a screw head - Line female drive.
<ul><li><a href="//commons.wikimedia.org/wiki/File:Screw_Head_-_Polydrive.svg" title="File:Screw Head - Polydrive.svg">Screw Head - Polydrive.svg</a>: <a href="//commons.wikimedia.org/wiki/User:Inductiveload" title="User:Inductiveload">Inductiveload</a> / derivative work: <a href="//commons.wikimedia.org/wiki/User:Wizard191" title="User:Wizard191">Wizard191</a> (<a href="//commons.wikimedia.org/wiki/User_talk:Wizard191" title="User talk:Wizard191">talk</a>)</li></ul>
2010-11-17
Own work based on: <a href="//commons.wikimedia.org/wiki/File:Screw_Head_-_Polydrive.svg" title="File:Screw Head - Polydrive.svg">Screw Head - Polydrive.svg</a>, <a href="//commons.wikimedia.org/wiki/File:Screw_Head_-_Polydrive.svg" title="File:Screw Head - Polydrive.svg">Screw Head - Polydrive.svg</a>  and <a href="//commons.wikimedia.org/w/index.php?title=File:32&amp;action=edit&amp;redlink=1" class="new" title="File:32 (page does not exist)">32</a>