This multichuck allows you to quickly and easily change accessory bits on Dremel rotary tools without changing collets. It will accept all accessory bits with 0.4mm to 3.2mm shanks. Now have tool-free accessory changes Eliminate the collet and wrench when changing Dremel accessories Accepts all accessory bits with 1/32\" to 1/8\" shanks, use with rotary tool models 4000, 400, 3000, 398, 395, 300, 285, 275, 200, 100, 8220, 8200, 800, 780, 770, 7700, 750 Also use with Dremel attachments 212, 225, and 575