- The multi-functional root canal file box is made of stainless steel, and there are several holes and slots for measuring the length of the root canal file on the product, which plays the role of recording the number of root canal files and measuring the length of the root canal files. - Passive products. - Non-sterile . - Used for recording the number of root canal files and measuring the length of root canal files. **For further product information, please contact Chat Support**