These release with a lateral twist and are less likely to release with upward stroke or pull. They feature 4 degrees of float for free movement and less joint stress. Casual riders may prefer SM-SH56 multi-release cleats which are easier to unclip.  

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