SM-SH51: Single-Release

• Releases in lateral twist mode, with 4 degrees of float
  Stock replacement cleat for all Shimano SPD pedals
  Regularly replace cleats to maintain proper pedal function and foot stability
  Frequent riders should replace their cleats at least once per year
  Use with 2-bolt mountain bike, gravel, or fitness shoes

SM-SH56: Multi-Release

• Multi-directional release; works with all SPD pedals except PD-M858
  Stock replacement cleat for all Shimano SPD pedals
  Regularly replace cleats to maintain proper pedal function and foot stability
  Frequent riders should replace their cleats at least once per year
  Use with 2-bolt fitness, mountain bike, or gravel shoes