placchette spd shimano con sgancio unidirezionale sm sh51Features: For SPD, unidirectional release type. To release the cleats from the pedals, rotate the heels outward. Without locking nut spec. Cold forged and heat treated to increase durability and stiffness for demanding use even in extreme conditions. SPD cleats have been specifically designed to match SHIMANO pedals and to prevent damage; this is the advantage of components engineered to work together.