Twisted NiTi File Size 25, 0.04 Taper, 23 mm Length - 3/Pack The Twisted File is a rotary nickel titanium file used for endodontic (root) canal preparations. • R-phase heat treatment technology • Twisted design, not ground • Advanced surface treatment • Safer, efficient shaping • Significantly lowers the number of files used per endo case • Improves clinical efficiency in completing endo cases • Reduces chairtime for patients • Greatly lowers the level and cost of file inventory normally needed in the office