Today Hitachi announced the release of a new line of magnetic driver-bit, each with a rare-earth magnet in an aluminum collar attached to the end of the bit.
Made from S2 steel with a black oxide finish, the design allows some movement in the magnet to allow the fastener to sit flush against the magnet, as well as to get out of the way far enough for counter sinking.
The bits are all 2″ long and are available in Phillips #2, Square #2 and Star T25 on an impact-ready shaft.