FILE AND MANUFACTURE THEREOF

摘要

PROBLEM TO BE SOLVED: To provide a low cost rigid and keen disposable file. SOLUTION: A file 1 is made up of a metallic covering part 4 on which file teeth are formed, and a supporting body 3 surrounded by the covering part 4. By this structural form, a very thin plate is used for the covering part 4, For the supporting body 3, a cheap plastic material can be used.