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