The sliding lock sent was not the same as the photograph on the website. Therefore I had to do a lot more chiselling than should have been necessary. Eventually, I did fit it. I would question the quality of materials. Two screws snapped internally to the door frame when tightening (This was not because I was overtightening - I have a broken clavicle). The screws also had a domed head which didn't fully sit in the countersink. I replaced these with flat head screws. The sliding bolt is a little slack in the guide but overall it seems to work OK. Obviously Handles 4U would not be my first choice next time. Sorry