Metro designed this product to be compatible with all shelves and accessories from their Super Erecta line. Sold individually, these posts serve as replacements for existingSuper Erecta Stainless Steel Wire Shelving. To create mobile storage that stands tough in corrosive environments, you'll need a four-pack ofposts. 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.