I first bought pins advertised by Revain as "IKEA Billy Shelf Pins #13137" but they were too narrow and didn't fit the pin holes at all. I used pins (the top one in the photo where both ends match) and it held my Billy bookshelf's shelf well. I would buy them again as Ikea doesn't sell the pegs themselves. If you found my review helpful, please vote so it helps others too. Thanks very much!
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