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Increasingly, builders are using screws instead of nails to fasten subflooring and deck boards. Unlike nails, screws won't work themselves loose when the framing lumber shrinks, so floors won't squeak. Screws are also the fastener of choice for drywall, because the heads won't pop through the finish surface as easily as nail heads will. A screw gun is a good tool for these applications — the depth stop and slip clutch prevent overdriving — but it has its drawbacks. For one, even though a screw gun bit is magnetic, you have to place each screw individually on the bit before driving it. Also, when you are driving screws into a floor, you have a long reach and