So I got three sets of these runners for my 1964 kitchen drawers when I noticed that one of the originals was very wobbly. They shouldn't be shaky. The wobble wore down the wood on the box itself. Anyway, I removed the old slides and installed these. They have small prongs that grip the wood which makes them very easy to install considering they were in the most awkward spot. Huge improvement! After installation, the boxes move much better. I was glad to find them on Amazon as after much searching at my local hardware stores it was clear they didn't sell anything like this. Don't waste time searching, just assume Amazon is your new home improvement hub like mine!