My daughter, at Peterson Air Force Base in Colorado Springs, called in a panic. Her husband is eating dust in Afghanistan and she needs bookshelves. So, she went to the BORG and bought an assemble yer self set. Won't go. These plastic thingys (I know not a good pic) set in pre drilled holes then the screw is fastened to the adjoining piece. Problem(s) the plastic thingy is too big for the hole, must be banged in crumbling the MDF. Then once it's in it's loose. Guy at BORG told her to use epoxy. She tried that, it didn't set up. Plus once it's in there is no way to get a screwdriver onto/into the screw. She couldn't tell me what kind of screw it is. "Has four things." Probably a square head. They did not provide any tools. In the end, she said it doesn't have to look good, nobody will see it in their bedroom. I told her to get 'L' brackets and screw the thing together. BTW, she has a rechargeable screwdriver/drill and other tools. It was a wedding present from me to them. Most used gift they got. Daddy knows.