Prime-Line U 9846 Patio Sliding Door Loop Lock – Increase Home Security, Install Additional Child-Safe Security, 1-1/8 In. Hardened Steel Bar with Diecast Base, Nickel Plated (Single Pack)

Don't take the "Frequently Returned Item" box as a sign this is low quality. It is not. I got tired of having to bend down behind the couch every night to put the 2 x 2 in place so the door wouldn't slide. This turned out to be the perfect solution. Five stars all day long. I suspect the "Frequently Returned" is due to things like not having the space to mount or the correct tools. Below is what you need to measure and need to mount properly.Tools you are going to need to mount properly.Drill. Even a cheap $12 corded drill, doesnt matter.3/32 metal drill bit for starter holes. (Titanium works best and is cheap)Fine point Shrpie or pencil.Phillips ScrewdriverThese are 3/4" wide, so at a minimum, with door fullly closed you will need a surface of 3/4" for both the latch and reciever side. The minimum distance with the door closed from the outside of the latch to outside of reciever side is 2" in order for it to lock. So if your door frame or outside trim is less than 3/4" with a distance from outside to ourside of the mounts of 2", this likely won't work. Also keep in mind that part of your glass is inside the door frame,so you don't want to be drilling holes through and cracking the glass.Mounting (For me) that took less than five minutes.Decide where you want to put it.Put the lock together and hold it in the position you want to hold it and mark the screw holes with the sharpie or pencil.Drill the starter holes.Screw in with Phillips Screwdriver.Simple to mount. Works well.

Bought this to replace the flimsy and always breaking screen door "locks" that are out there. This is super strong and relatively easy to install. I has to prop the jamp side hardware a bit to get the proper clearance for the bolt to fit and work. But other than that, pretty easy to install. Works really well. As far as I can see this lock is 100% better than anything else that is currently available.

I replaced the sliding glass door handle on an older sliding glass door (built in 1980s) and the lock didn't quite work correctly. So I bought this lock.This lock is great! It is so much safer than the handle locks. I cannot be lifted off the track like the handle locks. It looks great with the door and makes me feel so much safer! For such a reasonable price, I recommend it for anyone who needs a good reliable lock for their sliding glass doors. Since it fits on the frame of the door, it fits pretty much all sliding glass doors.

Great and strong. Could be a bit cheaper

Absolutely easy to install in our sliding doors and it gave us that extra security we were searching for. There is no way the door will open with this lock.

Excellent fit. Be sure to measure the width of the door track prior to ordering. Good value and strong locking system. We have a massive glass sliding door to our patio and pool. Adds an extra layer of security and safety. Our kids are not tall enough to unlock and gain access to pool unattended. Looks great.

Bought for sliding patio doors has extra lock security works perfectly in installation very easy under five minutes. One person needed to install. It’s always nice to have an Additional lock and sliding glass doors for the price it can’t be beat. You can find it in your local hardware store, but by the time you spend money on gas to go to the store, you can have it delivered for the same amount amount or less highly recommend this item.

Simple to install and works great