Reddit reviews Bi-Fold Door Bottom Pivot Kit, Two 3/8 in. and Two 7/16 in. Plastic Base Diameters, Grooved Steel Pivot Tips, Adjustable, Pack of 4
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Used to replace missing or damaged hardware of bi-fold closet door systemsThis kit includes a choice of two pairs of bottom pivots, one with 3/8 in. diameter and the other with 7/16 in. diameterThe adjustable steel pivot screws feature grooved cone-shaped pivot heads that fit into jamb or floor-mounted brackets (not included)Bases are constructed of plastic and come white in colorBottom brackets compatible with these pivots include the following: N 6697, N 6674, and others
It looks like a bifold door pivot pin https://www.amazon.com/Bi-Fold-Plastic-Diameters-Grooved-Adjustable/dp/B07N8V733G/ref=asc_df_B07N8V733G/
https://www.lowes.com/pd/National-Hardware-0-425-in-Bifold-Closet-Door-Bottom-Pivot-Pin/1000144523