We’ve hung a similar sliding barn door in our other house just 2 years ago. Sadly this door is nice, but the description is misleading. To “Pre-Drill” you will need to drill. That’s understandable… but no where did it say you have to cut a 42 inch straight line across the bottom to glide on top of the metal stabilizer. You need a table saw for that and a drill doesn’t accomplish the task. 

Do not buy this door if you can not do that or it’ll be unstable. You could hit the other side of wall every time you close it which could damage it obviously.