Morse code wrench, you have to feel it for bumps....
(ducking)
I have also seen totally unmarked versions of that wrench tho....
The wrench with the hole in it I think Wrenchmench posted a while back, and I have one somewhat like it, but I don't think there was any consensus on who made it...
Edit: See below.
That big wrench would cost you about $25 new, so I think you made out for $4 LOL