In my experience you get what you pay for with these. I've had el-cheapo tool sets arrive with items before (like with my scroll saw that has a flex shaft connection), and frankly they're terrible.

A drill bit is a rotary cutting tool that makes holes. The point of the bit contacts the material you're drilling into, while the shank — the back end — is clamped in place by the jaws of a ...

The bearings supported a modified pin vise that acts as the chuck for securing rotary tool bits. A 20-amp ESC and a servo tester control the motor’s speed and can get the motor up to 18,000 rpm.

Dremels and Handheld Rotary Tools With Dremel offering quite a few different tools now, I do specifically mean its classic handheld rotary tools (such as the 4300, 3000, 200 and 8220).