Review on HUHAO Cobalt Circuit 0 2 1 1Mm Diameter by Richard Payne

These drill bits are EXTREMELY brittle and brittle. Like, the pen is fragile. Serious. I couldn't use them for their intended purpose. Each of them broke in half almost immediately. I suspect if you were using them in an expensive, very precise drill press with literally zero lateral movement they might be of limited use, but they definitely shouldn't be used in hand drills or dremels. Unfortunately, mine are all in the trash.