None of the Misc. Peripherals recipes show up in NEI. There are almost as many different possible turtles as there are microblocks, so I'm actually kinda glad its not filling up NEI with lots of extremely similar recipes.
According to the Misc. Peripherals
thread you can get a wrench turtle with the IC2 Wrench, BC Wrench, or RC Crowbar and regardless of what you use it will act like all the wrenches it knows of. I seem to recall seeing something with a crescent hammer somewhere (which is what you're talking about I think), but I can't seem to find it in that thread.