CAL Double Bolt Lock - Sliding Patio Door Locks - Child Proof Sliding Door Lock with Anti Lift Security Lock - Replaces Sliding Door Security Bar - Adjustable & Fits Most Doors (Gray)

Very useful, easy to install, and seems to make the door much more secure. At least my German Shepherd has not figured this one out yet.

Great lock. This is a replacement for one that lasted 4 years.

Works great. Easy enough for adults but my kids can’t figure it out, perfect!

Cheap plastic internals, no instructions included inside as stated on packaging. Unable to figure out what all the included pieces are used for. Filing a claim with Amazon to return. Do not buy this item.

This is a great device to lock your sliding doors. It makes the outer door very secure then the rod on the track will secure the inside door just fine. It would have gotten 5 stars if the directions were good and it had more adjustability. I almost returned it because directions are only 3 distant poor pictures on the back. No explanation of the various included spacers and brackets. I worked about 4 hours on the first one and finally got it to work. The next two were easier to install but I was still just totally in the dark on the various spacer usages ( and I have done a lot of handyman work around the house for many years.) Still this lock is strong and it is the only good solution I have found ,that does not require drilling into the door jamb finished wall which in our case was a stucco - over concrete block wall which probably would have cracked.