/diy/ - Do It Yourself

>>1240742
>at least capable of reliable driving 3" screws into timber
The tool you're looking for is called an impact driver. Most are cordless these days because they're small enough and with plenty of power that there isn't much point in bothering with a corded one that you can't just pick up and use anywhere. They have a quick-change 1/4" bit holder that should handle most any driver you'd want. Milwaukee has an excellent 12V line with an impact driver that should suit your needs. Is there any particular reason you're pursuing lightness over other factors?

An impact "wrench" is a larger tool with a square driver that goes into sockets. 3/8" typically have the torque for lag screws and such, while 1/2" are typically for automotive use.