It's a pilot hole maker by Stanley. I've never seen another one and don't remember where I bought this one. It rode in our camper toolbox for years. If you've got the right size screw and the wood isn't too hard, you can make threaded pilot holes with this little gem a lot quicker, and with less mess, than you can pull out your cordless drill. And it can get you into some spots that the drill won't fit.
Steve & Lulu Yoder
S/V Siempre Sabado
He who dies with the most tools, wins.