Spring LOCK Anti-Theft Picture Frame Hanging System - (Set of 50)The versatile way to hang pictures and mirrors safely and securely. Locks onto almost any screw in the wall. SpringLOCK fits over almost any screw, 6, 8, or 10 in a wall. Leave 3mm clear under the heads. The Locks are pushed home with thumb pressure and can only be removed with the special Release Tool. Two SpringLOCK Bridges are fitted to the frame. Two screws are fitted into the wall, in corresponding positions. Frame is offered up and the Bridges