This 12pc. needle file set uniquely stored like a "Army Knife of Swiss ".  
Files lock & release with a press of a button. 
Each file is housed in a slide-apart body mechanism.
Body halves are ergonomically correct for singular file use.   
Profiles include: Round, Half Round, Flat, Knife, Three Square, Square, Barrette, Jointing, Slitting, Marking, Equalizing and Crossing.