Amazon.com.au:Customer reviews: Defender Security Brushed Chrome U 11325 Door Reinforcement Lock – Add Extra, High Security to Your Home and Prevent Unauthorized Entry – 3” Stop, Aluminum Construction Finish
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This version is a cheap knock off of the version you might find elsewhere. I've had these types of locks in previous homes and those previous ones operated much more smoothly. This one is poorly machined and not as easy to quickly open or close. It also weighs less than half as much and seems to be made from a cheaper alloy, so I question how much force it could withstand before snapping.
I installed one of these on a wood frame with zero issues using the long screws. All the reviews are right - it's excellent, very competitively priced and it's not going anywhere. As to my installation on a metal frame, well that proved more problematic. The instructions suggest that the product can mount to metal frames but it doesn't provide much in the way of specific instruction. I assumed that the short screws included in the package were sheet metal screws intended for metal jambs.
They didn't quite work. The end result was that the lock wasn't firmly affixed to the frame (it wiggled and moved) but the screws could not be tightened any further.
Seems like either the countersink in the product doesn't match the profile on the screw head or the screws run out of thread before being completely secured, or both. Not a problem with wood jambs but definitely a problem with metal. I fixed this problem in my case by placing a spacer plate I quickly hacked up between the product and the door jamb to move the product away from the jamb - fortunately I had enough of a gap to accommodate. With this spacer in place, the screws could be firmly tightened and the lock mounted securely.
Awesome design. Extremely secure. You'd have to crash a car through my front door to open this.
We have double front doors design. So I've installed this upside down at the top of the non opening door. So along with the two pins the door already had, with this new U lock, it's seriously secure now.
The secure-ness comes from the fact that the screws are perpendicular to the direction of forced entry. If it was parallel (like if you were able to pull the screws from the head out) then yes one can use force to break loose this lock.
But being perpendicular to the force of entry , it is impossible to break this lock without actually unlocking it yourself from the inside. Now the danger is, you may forget to unlock this and exit through the garage door (and close it), now you cannot enter through your front door !! HAHA.
This works really well but the attachment piece was too short to fit flush in our doorframe and still make contact with the door. We had to jerryrig and attach a small extension and now it works fine. We are renting and didnt want to carve out the door frame, but that may have solved the problem as well. We purchased this to keep out kids in, not to keep intruders out, and it has worked perfectly in that regard. It can be installed at any height and requires fine motor skills and strength to open that our toddler hasnt developed yet.
This unit is effective and very easy to install. The only challenge we have is the sharpness of the part that you need to pull at to lock and unlock the device. It needs considerable pressure and the part you press on, is so sharp it simply hurts like hell. Now, I am not some delicate flower, mind you, and have rough hands with years of tough work, and I say it is sharp and unpleasant to lock and unlock. Other than that, it works like a charm.
Very easy to install and does the job for additional security to deadbolt. It looks like it should be able to deter some baddy who wants a quick and easy entry. I better not lock myself out of the other entry doors to my house or else I won't be able to get in without breaking in. The machining is a little rough but acceptable.
This did not work for my door as it has thick mouldings. As well the product finish is bad and edges are sharp. I actually cut my finger. You may have to file the edges down so you don’t cut your self. Manufactures finishing is very poor. Item was returned to Amazon.
Lock is very sturdy and easy to install, once in place door stays closed. I bought this not only to keep people out but also as a deterrent to keep my 95 year old father in law from wandering out in the middle of the night.