A post segment for a window grille configured to be attached to a window, the window grille comprising at least one grille panel configured for preventing entry or exit of a person through the window, the at least one grille panel comprising two side posts spaced apart by a plurality of crossbars, the post segment comprising: a body having a first end, a second end and a hole in a side of the body wherein the first end and the second end are configured to allow the first end of one of the post segments to engage the second end of another of the post segments such that a plurality of the post segments can be assembled end-to-end to form each of the two side posts and wherein the hole in the side of the body is configured to engage an end of one of the plurality of crossbars
