Shimano PD-M821 Saint SPD Pedal 

Improved axle durability (vs. PD-M820)
Wide contact area enhances stability when paired with SHIMANO AM series shoes
Thin pedal body lowers stack height and improves obstacle clearance
Four height adjustable pins per side for improved grip when not clipped-in
Non-pop-up alloy pedal body for simplicity and durability
Slim and durable chrome-moly spindle with 8 mm hex wrench mount
Pedal body protects binding mechanism against impacts
Robust retention claws provide smooth engagement and release
Adjustable entry and release tension settings