Defender Security Door Knob Lock-Out Device, Diecast Construction, Gray Painted Color, Keyed Alike This knob lock-out device is used to prevent access to the keyhole (on door knobs) This lock-out device is used to block access to the keyholes in door knobs of up to 2-7/16 in. outside diameter of round door knobs Diecast construction Cylinder is held in place with an O-ring and is removable when device is open and unlocked. The cylinder cannot be removed when device is closed and locked NOTE: THIS LOCK OUT DEVICE IS NOT DESIGNED TO PREVENT TURNING AN UNLOCKED KNOB, BUT RATHER TO BLOCK ACCESS TO THE LOCKED KEYHOLE This knob lock-out device is used to prevent access to a standard door knob The maximum outside diameter round door knob that can be protected with this lock-out device is 2-7/16 inches Gray painted finish Diecast construction