- Imd M Pro 04/20. - Establishing straight access to 3mm to root tip with #18 file. - Determining the working length by SS K file #15. - Preparation with #20 file (.04 taper) to the working length. - Preparation with #25 file (0.06 taper) to the working length. - M-Pro File #20 31mm Pkg of 6. **For further product information, please contact Chat Support**