I spent about 6 hours trying to install one of these locks, I finally gave up - you need a magnifying glass to read the instructions and see the pictures, and none of the pictures seem to correspond to the instructions- I wasted $20 on these locks which are now sitting in a bag in my garage. I'm usually pretty good with assembling things (I've installed my own ceiling fans and built my own shelves!) - but these are impossible - dont waste your money.