Ever need to keep someone out of a locked room or house that has a key? This little gem fits over the door knob, effectively blocking the key slit and preventing someone from using a key to enter the room or building. The tight fitting tolerances prevent the two halves from being pried open and the locking bar turns to lock both halves together with a "T" bar. The roll pin hinge is only open at the insertion side and cannot be pushed or "punched" out.
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