I have several Ikea shelves at home. One problem I constantly run into is the underlays falling off and then expanding causing the shelves to collapse due to the tiny support pins that come with them. I would normally fix the furniture but in one room I have a set of three Hemnes all screwed to the wall and to be honest I'm too busy at the moment to unload, unscrew and try to fasten them repair. I figured if only I had longer shelf supports it would give me some time. So I bought these shelf supports and they worked! They fit perfectly into pre-drilled holes and are incredibly strong. They hold the shelves like a boss and I'm grateful to be able to put off the furniture repairs until I have more time!