The SAF file is an endodontic file designed to be operated by a Profin dental low-speed hand-piece (W&H, Burmoos / Salzburg, Austria), which converts rotation into a transline reciprocal movement. The active part of the file is manufactured from a thin-walled tube of medical grade nickel-titanium alloy. It has a cylindrical shape and can be compressed to allow its insertion into thin root canal, due to its lattice-like structure.