Screwdrivers are a no-no, not necessarily as a weapon but as a means to gain access to stuff on the plane.
Screwdrivers are NOT prohibited, so long as they are shorter than 7 inches. All tools were prohibited in the immediate aftermath of 9/11 while the airline fleet was having its flight deck doors upgraded...that prohibition was relaxed when all aircraft had armored doors, around 2006 or so...
What Can I Bring? All | Transportation Security Administration