SPD cleat set
Shimano makes a couple of different cleats to fit their mountain pedals;
the M-51's and the M-56's. These are the M-51's, and they release by
twisting your heel out to the side only. The M-56's will release
by twisting your heel in any direction, and are better suited for spin
class and stationary bike applications.
Use these cleats for Shimano mountain pedals and hybrid road pedals only.