Size (length*width*height): 10cm x 10cm x 5cm

Shimano SPD SM-SH51 SM-SH56 MTB Pedal Cleats

Shimano SPD SM-SH51 MTB Pedal Cleats
Shimano cleats SM-SH51 with single direction release - Fits all Shimano SPD pedals except PD-M858.
Release the cleats from the pedals by twisting your heels outward.
Product features

Model: SM-SH51
Pedal system: SPD
Release: Single release - Releases the cleat by twisting heel outwards

Compatibility:All SPD-Shoes/-Pedals (Not compatible with PD-M858)
Include:1 pair Shimano SPD SM-SH51 MTB Pedal Cleats
Cleat nut not included!

Shimano SPD SM-SH56 MTB Pedal Cleats
Shimano cleats SM-SH56 with multi release - Fits all Shimano SPD pedals except PD-M858.
Exiting the pedal is possible not only by twisting the foot to the left or right, but also by pulling it off to the top.
Product features

Model: SM-SH56
Pedal system: SPD
Release: Multi release Releases the cleat by rolling or twisting heel in multiple directions

Compatibility:All SPD-Shoes/-Pedals (Not compatible with PD-M858)
Include:1 pair Shimano SPD SM-SH56 MTB Pedal Cleats
Cleat nut not included.

The SH-56 is a good option for road/commuting when you might need to unclip a little easier and more often but the SH-51 is better suited for off road.