Our Tandem box contain totally: 2 extra strong full extension side runners, with soft-close features. 2 steel drawer sides with cover caps. 2 back brackets or a back plate depending on the bin model. 2 front fixing brackets. Package content: 1 pair 20 in. double wall drawer set, tandem box with integrated rear panel fitting and progressive roller Full extension features: full extension slides also telescope, allowing the full length of the drawer to clear the cabinet, choose these when you need easy access to the rear of the drawer, as in a file drawer Soft close functionality: soft close functionality help to close drawers softly, safely and quietly, preventing drawers from slamming shut, stopping damages to drawers and keeping items from shifting within the drawers, high load rating allows you to install those slides on any type of drawer Load capacity: 110 lbs., length: 20 in. (500 mm), material: steel, color: white metallic Features Item Weight 15 Features Soft Close Slide System Full Extension Weight load per set (lb.) 110 Finish Family White Material Steel Mount Type Side Mount Returnable 180-Day Builders Hardware Product Type Drawer Slides Drawer Slide Type Side Mount Package Quantity 1 Slide Length (In.) 20 Product Height (in.) 4 Maximum Expandable Length (in.) 40 Product Width (in.) 3 Manufacturer Warranty Limited Lifetime Warranty