I recently replaced our weathered and worn brass entry door knobs with the Schlage handleset F60 CEN 619 LAT. we have double doors so I bought two handlesets. I was very pleasantly surprised at how exact and detailed the instructions were. Especially helpful was the 3D graphic showing all of the critical dimensions. I followed the instructions carefully and had great results. My early employment was as an engineer and I consider myself good with mechanical things. But, after this project. I feel anyone with basic reading skills and a screwdriver could have the same excellent results that I achieved! This hardware looks great, has a strong beefy feel and was easy to install. My hats go off to the designers. All in all this was a trouble free and enjoyable project.