Stem Caster Carts combine Super Adjustable Super Erecta BriteTM wire shelving features with the mobility of stem casters to provide a high-quality, strong and versatile material handling cart. The Corner Release System and SiteSelect Posts, combined with the original "bottom up" assembly process, creates a complete shelving system in minutes, without tools! SiteSelect Posts with the double-groove visual guide feature have circular grooves at 1" (25mm) intervals and are numbered at 2" (50mm) intervals. Shelves simply seat into place using the Corner Release. Open wire surfaces minimize dust buildup and increase air circulation and visibility. Configuration possibilities include solid or wire shelves and a selection of swivel, rigid, or brake-type casters for maximum maneuverability. Bolt leveler on post bottom compensates for uneven surfaces. Variety of Casters Available: Select the caster that allows the right combination of rollability and maneuverability to suit your requirements. Casters are available in swivel, rigid or brake types. All Metro casters are non-marking and come complete with a 3½" (89mm) donut bumper.