SM-SH51 SPD CLEAT SET (PAIR) SINGLE RELEASE W/ CLEAT NUT For SPD, single direction release type Release the cleats from the pedals by twisting your heels outward With cleat nut specification Cold forged and specially heat treated to increase durability and rigidity for heavy use even under severe conditions. SPD cleats are engineered specifically to match SHIMANO pedals and avoid damage - the big advantage of having single-source parts.