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A cotter pin is a fastener that is shaped like a pin, with a round, bent head. It is inserted into the hole and the legs are then spread apart to prevent it from falling out of the hole. It allows several objects to be stacked and then secured via shaft, when the diameter of the inner hole of the fastened objects are too big for a bolt to fit in or when the use of a bolt is not possible. A cotter pin is also used as a quick release lock. Auto Parts Network carries all the parts needed to secure different components in your vehicle. Hide