Unbreakable plastic, with textured surface for non-slip grip and specially shaped to fit the hand for working comfort even over long periods. Hole at top permits convenient hang-up storage near work bench. Tang gripping insert is tempered metal, with two threaded sections of different diameters. This assures proper alignment and positive hold for files. Threaded metal insert allows handle to be reused... simply unscrew the file in use and insert a new one.