This little thing is the absolute BEST TOOL -- possibly the only really useful tool, in fact -- I have ever bought at Radio Shack. It has a reversible/lockable ratchet, takes *standard* full-size driver bits on one side and has a socket head on the other, and it's absolutely amazing for getting into all sorts of tight places where a standard screwdriver can't fit. I've had mine for years, and I still use it all the time.
If you don't have one, BUY IT. I paid nearly $20 for mine at a local Shack location, and it was a great deal even at that price.
This 17-piece reversible ratchet driver set features a durable, rust-resistant steel ratchet, bits and sockets. It works with a variety of screws and fasteners and is a welcome addition to any tool kit.