Like most other reviews this one requires assembly. I don't mind, attaching the feathers to the brushes is easy. They will NOT fit the Dremel 4000 HOWEVER. These brushes are larger than the Dremel hub and will not fit inside. The nibs are also much longer and thinner than Dremel brush nibs. Even if the brushes fit, they won't seat properly with these springs. I do not recommend them for Dremel 4000 parts.
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