Turn the ST connectors into SC connectors. Enables the user to attach industry-standard fiber optic connectors to a standard 7/8" (28 threads per inch) optical input port. Machined, anodized aluminum body. Features a weighted and balanced design, which allows it to be spun on with as little as a flick of a finger. No surfaces come in contact with the fiber or ferrule endface, virtually guaranteeing that the quality of the optical surface will not be degraded when connected to the meter.