Here's the one's I bought for doing computer and other e-scrap, the blue one seems to last longer on a charge. $19.95 each, the blue one I got from Menards, the other Ace hardware. You just push a button and you twist it for getting into tight places. The 6" bits are real handy for taking screws out of tv's and monitors. Be sure to read up on discharging a tv before attempting a teardown.
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