Luthiery Laboratories

I have several hand drills, cordless and corded. For real work, a massive DeWalt cordless powers easily through concrete. But you don't need all that to build a guitar, in fact, you don't even want it. The DeWalt is expensive and weighs a ton. For light use, a little cordless Ryobi or Black&Decker will do just fine and is a lot lighter on the arm and the wallet.

A note on my Black&Decker cheapie: although the battery is removable, replacements are not available. Mine has lasted a long time and is still going strong, but when it goes, the whole drill is garbage. Look into replacement batteries before buying any cordless tool.