Mity Files. Nickel Titanium (NiTi) Instrument.The Mity Roto T6 is a .06 taper rotary instrument specifically designed for use in a rotary handpiece. The unique flute design offers speed and tactile control while preparing a smoother more uniform canal. Max spreed of 300rpm.Available in: 21mm & 25mm. Sizes 15 thru 40 & Asst.Packaged in box of 6 pcs.