The Smart-Key has been developed to ensure full activation detection while turning RPE screws. Simply move the key tip toward the front stop, insert the key into REP expander screw and push the key handle toward the throat. The key head and tip will rotate as the RPE is activated. Push the key until a full turn activation stop is reached, a slight 'bumper 'click may be felt as the full activation stop is reached. 10 PACK.