1 Pair Self Soft Close Under/Bottom Rear Mounting Drawer Slides 21 inch Concealed Drawer Runners;Locking Devices;Rear Mounting Brackets;Screws and Instructions Material: Work harden cold rolled steel with zinc plated finish will give you precise thickness and smooth surface Product specifications: Drawer Length:533mm(21");Runner Length:546(21-1/2") ;Cabinet Depth Range:598(23-9/16")-555(21-7/8"),please choose 21" slides. Package Includes: Selected Slides, Mounting Screws, Installation Instructions Function:Soft close drawer slides are ideal for cabinetry, desk pedestals and general storage drawers. High load rating allows you to install these slides on any type of drawer. Quality Warranty: If there is any quality problem with your purchasing, please contact us. We will refund the item value or send a replacement.