I've never replaced drawer slides and didn't realize they came with no instructions but I've found how difficult it is? Well, it was quite difficult for me, but that was because I didn't know what I was doing. I acknowledge it. It also didn't help that they replaced some Mickey Mouse hardware in the bottom drawer of a fixed chest and I was working with a flashlight in my mouth, but I finally managed to install it. They're durable, I'll give them that, and they had a very smooth glide, but I did something very stupid. The inner surface that the outer brackets attach to is dark wood that doesn't have any pencil marks, so I raised the brackets by drilling holes and screwing them in. Drilling dust has gotten into the pre-greased chain bearings and is difficult to get out, but the box no longer gets stuck.