If you mean the screw keys - that's actually what got me interested in these.

Basically, I was looking for a "customizable screw key" so I could use other bits than just phillips and flatheads. This item is just about perfect for that.
There was actually
talk here at one point about ordering a bunch of these keychain screwdrivers, maybe branded for MT.O.
They are fairly cheap and there seemed to be a lot of interest. The only problem is that they have a minimum order of 250 at $1.94 each.
They might be available elsewhere for less though. I haven't investigated the bulk order options, since I have been concentrating on hunting down somewhere to buy them individually instead.