1High Strength Plastic: Made of high strength plastic material, The dental endodontic block file endures. The scale is clear and the measurement is accurate. 2Professional: Professional dental measuring instruments, dental measuring ruler used in root canal measurement. very accurate. 3Heat And Pressure Resistant: 135 high temperature and high pressure resistant, safe to use. Resistant to high temperature and pressure, durable to use. 4Use: Specially designed for root canal file block measuring, used in root canal measurement as an instrument ruler. 5Advantages: Multiple root canals can be placed with a root canal file, easy to clean and maintain, can be used for a long time with proper treatment.