Prime-Line S 4180 Door Knob Lock-Out Device – Prevents Turning of Door Knob and Access to Keyhole, Can be Used for Home Rentals, Evictions, Job Sites & More – Keyed Alike, Diecast, Gray (Single Pack)
$ 17
Price: $17.46
(as of Jun 02, 2025 00:55:18 UTC – Details)
This Defender Security doorknob lock-out device is designed to be mounted directly over the entry doorknob to prevent access to the keyhole only, effectively preventing unauthorized access by key. The durable, diecast cylinder is held in place with a removable O-ring for cleaning the cylinder when the lock-out device is unlocked and open. The cylinder cannot be removed when the device is closed and locked. This lock-out device is often used in evictions, rentals, home sales, on job sites, in-home, on in-office storage room knobs to keep other keyholders out, even if they have a key to the door. It is a quicker and easier solution than replacing the entire knob and lock system on a door while still getting the protection you need. The maximum outside diameter of a round knob that can be secured with this device is 2-7/16 inch.
DOORKNOB LOCK-OUT DEVICE – The Defender Security doorknob lock-out device can be placed directly over the entry doorknob to block access to the keyhole. Note: Measure your door’s handle diameter to ensure it will fit inside the lock-out device.
COVERS KEYHOLE – This doorknob security device is designed to keep the keyhole on the locked entry doorknob from being accessed, not the handle from being turned, effectively keeping other keyholders out.
REMOVABLE – The durable diecast cylinder is held in place with an O-ring and is removable for cleaning when the device is unlocked and open. The cylinder cannot be removed when the device is closed and locked.
DIMENSIONS – This lock-out device can protect rounded doorknobs that have a max diameter of 2-7/16 inch. Note that the shaft cut-out is circular in shape and measures 1-3/16 inch, so it may fit loosely over doorknobs with smaller diameter slender shafts.
APPLICATIONS – This lock-out device is often used in evictions, rentals, home sales, on job sites, in-home, in-office storage knobs and more. It is used in situations where you want to prevent other keyholders from accessing the keyhole to unlock
NOTE – Look for the keys inside the lock-out device as the may shift around during transportation
Customers say
Customers find the door knob lock-out device works fantastically and is easy to install with no tools required. They appreciate its security features, keeping them safe, and consider it well worth the money. The build quality and lock mechanism receive mixed feedback – while some say it’s well built, others report it breaking within two months, and while some praise the key and lock, others mention the locking mechanism falling out of the hole. Customers disagree on the fit, with some saying it’s perfect for standard round knobs while others find it not large enough for standard door knobs. The weight is also mixed, with several customers noting it’s surprisingly heavy.
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