From the Manufacturer
1/8-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) to hold the accessory in the end of the tool.
Product Description
Dremel 1/8" Collets Provides the optimal grip for bits offered for the Dremel rotary tool line and Heavy-Duty Flex-Shaft Tool (This collet is not suitable for the #236 handpiece)