As a lot of other reviews had said, they needed to make it 49 inches, with the last holes 48 inches apart. I have 16 inch studs and it will not work in all studs. If using it as a rail only with low weight I wouldnt have a problem using an anchor for the last one, but I was using it to hold storage racks which would have made every hole on the verical rail need to be off the stud as well. Seems like something so basic would be obvious...