A crown sizer for a metal hook hanger. The hanger includes a hook-receiving post having a pair of opposing projections extending outwardly therefrom. The sizer is mounted about the post, and includes a body formed of first and second pairs of opposing sidewalls. Each of the opposing sidewalls in the first pair includes an engagement shoulder on the interior surface thereof, the shoulders being located and sized to engage the projections thereby securing the sizer about the post.