Gutta Percha Removal Instrument. Designed by Yoshi Terauchi. EGPR/LR: TINY HOOK LEFT & RIGHT. Use your Ultrasonic Tip to create the hole. Press the Gutta Percha against the canal wall. Remove the material with the instrument. A study shows the tip size has to be less than 0.3 mm depending on how small the canal is. The tip has a .06 taper and the maximum diameter is 0.68 mm so that you can visualize what you are doing under the microscope. EGPR/UD: TINY HOOK UP & DOWN