Harken Carbo-Cam Cam Cleats #471. Harken Carbo-Cam cleats securely hold lines of any diameter with a quick downward snap of the line. Lightweight, fiber reinforced cams are intended for racing where weight is critical, or where adjustments are less frequent. Harken cam cleats release consistently and easily by pulling upward. Refined design features by sailors assure optimum performance. Offered in Micro and Standard sizes.