2pc 2.35 mm Shank Three jaw Keyless Drill Chuck Collet Conversion Adapter Clamping range 0.3-3.4MM-Round Shank

These are JUNK. The shaft is made of very soft metal and the three jaw chuck is not round nor lined up with the shaft. The first time that I put it in a rotary carving device it wobbled so badly that it bent the shaft without coming in to contact with the work piece. Can't recommend them for any purpose. They are being returned.

Two size adapters. One will close almost completely so it will fit those micro drill bits. I don't use the other side because I don't need it. My micro drill will fit all other bits I need.

You can't really use this because it is not straight. There are other reviews like this, but I thought they were perhaps using it wrong.... No... this really is bad. So crooked that it broke my micro-motor handle... $150 loss... :(

It’s a great idea but basically it wobbles massively. It would be wonderful if it didn’t

Bummer I wanted to like these. Unfortunately all three vibrate badly at speed in my nail drill. I chucked them up in my regular Makita drill so I could turn them very slowly. I put a 2 inch long straight rod in the chuck and ran the drill. All three have bad run-out that is easily seen on the drill. The little chucks work fine for clamping down but the run-out is unacceptable. I haven't been able to figure out how to fix it. The shaft attachment to the chuck is not concentric nor perpendicular. I could bend the connection (maybe) to fix the perpendicularity but I can't figure out what to do with the off center issue.