With Dremel chamfer bit part #618 you can attach this to turn your dremel tool into a micro router for putting very small chamfers on very small parts. I use it to debur saw cuts on non-ferrous metals and hardwoods, and to remove stubborn brim from 3D prints. I think it should fit any dremel or similar rotary tool but the only one I tested it on is Dremel 3000 which has ¾"-12 tool adapter thread. I recommend printing it with 0.15mm layer height in the threaded section so the threads will be accurate, because this is not a normal thread pitch that anyone is likely to have a tap they can use to clean up the threads. I printed it several times making dimensional adjustments until the threads came out as a perfect fit when printed with sufficiently low layer height.