Patented QuadTruss design (patent #5,390,803) makes shelves up to 25% stronger. Heavy-gauge open-wire construction keeps contents visible for quick inventory checks. All units are plated with a durable easy-to-clean finish. Quick-action locking feature with hasps for padlock. All units feature full-access double door swinging out at approximately 270°. Shipped knocked down for easy assembly and reduced transportation costs.