Maxdot Sliding Window Locks Adjustable Security Window Lock Window Stoppers Aluminum with Key Childproof Safety Window Lock Clamps for Vertical Horizontal Slide Door Windows(4 Sets)

I rent an older home, and the window locks don't hold well. I can't install anything permanent based on my lease so I needed a reversible solution. These worked perfectly, I was able to adjust them to every window size or shape in my house. When I need to crack a window for ventilation I can adjust my lock to hold in the new position. But last night prompted my review. I woke up in the middle of the night and for some reason I just had to get up and put a load of sheets in the dryer I had forgotten. I didn't turn on any lights. As I approached my "home office" I saw the screen had been removed from one window. Fingertips were tugging at the slighlty open window. I screamed at the top of my lungs "It's a window lock and I have a shotgun." I heard a thump outside and a figure fled through my yard pleading for me not to call his mom. I had left a bunch of expensive electronics in plain view right under that window. I might have lost my job if those items had been stolen. It's triple digit heat where I live and I only have a swamp cooler. I have to be able to crack windows for ventilation. These simple inexpensive locks prevented a crime last night. Worth Every Penny and more.

solid piece, I'm using them to mount tie-down hooks to my truck bed rail.

Good strong and sturdy lock with key. The key is handy. Easy to use on windows. The lock did leave a mark where the screw hits the wall /lining if you make it very tight. If you are worried about making marks on your window, then you will not like this.

I originally got this set of four locks thinking they would work well for our two sets of windows that slide open from both sides to allow for circulation of air using the same theory as a double-hung window. This lock works really well on the side of the window that opens on the inside of the frame, but there is nowhere to put the second lock on the side of the window that opens to the outside of the frame. Since unlocking one side of the window unlocks both sides, that leaves one side still vulnerable. The only thing I could do to secure the outside window would be to put a stick or something in the track so it couldn't move at all. That's a shame because this lock system works REALLY well. They would work perfectly if I had three panels in these windows instead of two, so there was a solid window in the middle of my sliding ones and two separate lock systems on them. Each of the four locks has its own key which you take out after the lock is tight on the frame, but I would put three of the keys away for spares and use only one key at a time to operate all the locks if I were to use them regularly. I debated a four or five star rating for these locks since they don't work for the windows I intended them for. Then I realized there is nothing wrong with the locks themselves, which work perfectly. I should have made sure they would work on the windows I have in my home. I gave them to my kids, who DO have windows that they'll work on. They're really excited since they have young children who have figured out how to climb up to the windows.

These were very easy to install, but there wasn’t any directions in the package. There was an extra piece in each bag that wasn’t explained because of the lack of instructions. Besides that, these are self explanatory and they worked as expected. They are sturdy and I feel confident that they will do the job. I recommend these to purchase if you are looking for a good primary or secondary means of security.

These were easy to install BUT my kids are able to push hard enough on the window and force it to slide down the track. I was pretty bummed that these didn’t work as well as I had planned.

I needed locks for several windows that could prevent a window from opening further. These work as expected and also include a thin piece of plastic to place between the lock and window frame to keep the frame from being damaged. Appreciated that inclusion.

Fantastic product. Love the key. Makes the hex screw a piece of cake without hurting your fingers. Really appreciate not leaving the handle exposed for kids to unscrew. Well thought. This is the only window lock you'll ever need. PLUS - I can use the key for many other hex screws like adjusting chairs, etc. Only down side is that they don't sell this item without the key, so I ended up with about 20 keys. Wish I could buy more locks at a cheaper price if I didn't have to get one key per lock.