Applicable to Most Standard Door Knob/Handwheel - Fits round, tulip and oval door knobs, not to lever door handles. Suitable for faucet/tank with handwheel valve. Disable the Door Knob/Faucet/Valve - The device is made of stainless steel. It is designed to cover and lock around your door knob and prevent your knob from turning by locking-out access to the knob and keyhole. What It for - It can be used on the exterior or interior side of the knob. Case 1: When going out, you can use this device to lock the knob to add security. Case 2: When you're or hotel, like sleeping, you can use this device to lock the exterior knob to add security. Case3: Prevent someone, such as people with dementia, from wandering out of . Case 4: Prevent child from operating the door knob/handwheel and prevent -operation. Easy to Install, Carry and Store - Just place the device over the door knob, lock and go. The device is built handy size. A pouch is included in package. With this pouch, the device can be stored and hung on the door handle or door stopper for easy access., Weight: 0.79586876582 pounds, Manufacturer: Prterver