Shaft larger than stated 1/4”, dimensions 0.257”, does not fit in adapter. They fade very quickly after one or two uses. After that, they heat up and burn the wood I'm trying to drill through.
Sometimes I need to drill in hard-to-reach places, so I bought an angle drill. I have long bits that I can use to poke through a few studs as I pull the wire, but obviously they're not meant to be used in hard-to-reach places. These "short" bits are perfect for drilling large holes with an angle bit and have worked very well so far.