What are the differences between Shimano SM-SH51 and SM-SH56 cleats for cycling shoes?

The main difference between Shimano SM-SH51 and SM-SH56 cleats for cycling shoes is the release mechanism. SM-SH51 cleats release by twisting your foot outward, while SM-SH56 cleats release by twisting your foot in any direction. This makes SM-SH56 cleats easier to disengage from the pedals, especially for beginners or riders who prefer more flexibility in their foot movement.