M8/M7 Mini drill Chuck accessory for Dremel rotary tool and mini grinder drill chuck 0.5 3.2MM Faster Bit Swaps dremel accessoy|Power Tool Accessories| - AliExpress
A handy little arbor for a Dremel Chuck
Complete Guide to your Dremel Tool and Dremel Attachments
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Dremel Chuck Adapter in the Rotary Tool Attachments & Batteries department at Lowes.com