Buy ReplacementScrews Shelf Screws Compatible with IKEA Part 104323/104325 (EXPEDIT Shelf Screws) (Pack of 4) Online at Lowest Price in Indonesia. B08KFJZ9DV
IKEA Billy bookcase tip: if you have an OLD Billy bookcase (pre-2014) you can still add extra shelves even though the new extra shelves from IKEA use a new, disc-shaped shelf pin.