Prime-Line U 9970 Deadlock – Jimmy-Resistant Design Prohibits Forced Entry by Spreading of Door Frames – Single Cylinder Diecast Metal Lock With a Brass Finish and Angle Strike (Single Pack)

Works very well. It was also very easy to install

Had a similar lock that went bad after many many years. I was able to install this lock with minor adjustments. What can i say, it's a true deadbolt.

Update to previous review. I took it apart and reinstalled it and it is now working fine. You need to find the proper position to install the pin that connects the cylinder to the lock. I tried a couple more times and now the lock turns much better. It is still quite lightweight and flimsy but at least I don't live in constant fear of being locked out of my house.This works but it is very flimsy. It is very light weight, compared with the one that it replaced. The locking mechanisms are not well aligned and don't move smoothly. Sometimes it gets stuck. I hope we don't get locked out at the most inconvenient time and end up paying serious money for a lock smith. Having said this, a more expensive "name brand" lock that I purchased, albeit studier, doesn't work much better than this one. Quality has gone out the window across the board!!!

Easy to install, sturdy, works perfect.

Was easy to install, you need a hole saw bit for your drill because this will not fit standard doorknob holes. I live in the ghetto and me and my wife were able to install this easily within an hour or so. The color is nice and its heavy and sturdy, a thief or someone trying to break in would have a hard time getting in.

I had a need to pass local home inspection and my 35+ year old double cylinder lock wouldn't pass. So, I bought this with the hope I could just replace the inside piece and leave the other older existing parts installed. Got the lock, unscrewed four screws that hold the lock in place and viola, it fit perfectly! Old key and strike mechanism were fine to work with the new inside lock that now has a code compliant knob to lock and unlock the door. Couldn't be happier!

My Dad installed this lock at least 20 years ago. It finally quit working. The cylinder would turn but the locking mechanism would not engage. It was not available locally at the 3 places I checked so I went to Amazon to get it. It is just like the old one and fits exactly. This made it easy for me to install with no problems. The door is 70 years old. If this new lock quits working, I will probably have to replace the door instead of the lock. Glad I found it on Amazon, and really glad the style has not changed since my Dad bought the first one. Recommend it for durability and safety. If you are installing it on a door that has never had a lock like this, it will be more complicated. I am not that skilled. The instruction are very clear and explain how to do it, and templates are included.

During installation the locking mechanism stopped working properly. Feels very cheap, and Im glad it broke before I wound up getting locked out.