what is this for?
I just got a set of shimano's pd-m520 pedals (a mountain bike pedal). aside from the hardware I expected (being the pedal, the cleat, and the stuff to attach the cleat) there are what appear to be four little turf-type cleats (rounded and metal on the end) and a plastic wrench for them. they look like they're supposed to screw in where the cleats do, but I can't fathom a good use for them. if you wanted to walk, maybe you can remove the pedal cleats and put these others in? Only thing I can think of right now.
I am using them on a road bike for city use, b/c they were cheap and someone I know likes them. maybe they have an off-road application I am not familiar/concerned with? Sorry no pics, spent my money on bike gear. btw, did check docs with pedal, no info or mention there.