Shelf support for bookshelves with 5mm holes

I created this to replace broken/missing shelf supports for bookshelves. They push into standard 5mm holes in the side of a bookcase. The spigot is deliberately octagonal rather than circular for better printing, and so that they have some give when pushed into the 5mm holes. The tab at the end is to allow them to be gripped with pliers to pull them out of the sides of the bookcase.