The Dremel multi chuck (4486) allows you to quickly and easily change accessories on your Dremel multi-tool without using collets. It accepts accessories from 0,4 mm to 3,4 mm shank. Now have tool-free accessory changesEliminate the collet and wrench when changing Dremel accessoriesAccepts all accessory bits with 1/32 in. to 1/8 in. shanksAlso use with Dremel attachments 212, 225 and 575