Dremel 1/8" Collet is suitable for a wide range of rotary tools including #245, #250, Series 3 Engraver Ro, #260, 270, 280, Series 2 and later, #275, 285, 370, 380, 395, 595, free wheeler 850, mini mite 750, Moto-Flex tools 232 and 332, Chainsaver tools 241, 246, 277 and 8504, flexible shaft attachments 225 and 90199, Handpiece 235 and 237. This collet is designed to hold 1/8" shank accessories securely in place, allowing you to perform a variety of tasks with your rotary tool.