Metro designed these posts to be compatible with all shelves and accessories from their Super Erecta line. This product includes four posts to help you create strong, corrosion-resistant mobile shelving specific to your storage needs. To purchase individually sold, replacement postsclick here. Compatible with Metro Super Erecta products Great for damp storage environments Constructed of corrosion-resistant Type 304 stainless steel Grooved every 1" and double grooved every 8" for easy shelf alignment *These posts are for use with casters. For Super Erecta SiteSelect Stationary Posts,click here.