1/16-inch collet for models 245, 250, series 3 and later, 260, 270, 280, series 2 and later, 275, 285, 370, 380, 395, 595, 850, 750, 232, 332, 241, 246, 277 and 8504; no. 225 and 90199 flex shaft attachments and handpiece 235 and 237. Collets work with the collet nut (threaded) as a means of holding the accessory in the end of the tool.