This Metro 13PBL Super Erecta post is made of steel for strength, has a black finish for resistance to corrosion, comes with a leveling bolt for use on uneven surfaces, and fits a 14-1/2" high stationary wire shelving unit (not included). The post is grooved at 1" intervals to help guide the installation of shelves (not included) at desired heights. It comes in a pack of four posts.