Dremel 480 rotary collet
480 is the fixed 1/8-inch Dremel collet.

How to choose
Use the fixed collet when the exact Dremel tool and accessory both specify this size. A separate smaller collet is needed for a smaller documented shank.
Compatibility and limits
Fixed Dremel 1/8-inch collet · check the tool model
Questions before buying
Which part determines whether the 480 will hold my engraving bit?
Use the bit’s shank diameter where it enters the collet. A small engraving tip can still have a one-eighth-inch shank. A different shank size requires the corresponding collet.