Elongated holes for depth adjustment & bottom mount holes Blum Rear Mount Bracket (Pack of 10 Luxotech offers the Blum tandem Plus blumotion complete Kit. 21 563 TANDEM plus BLUMOTION Undermount Drawer Slide for 1/2 Material, Soft-Closing | Würth Louis & Company Blum 563h Installation Instructions Blum Blum 21" TANDEM Drawer Slides With BLUMOTION, Locking Devices, Mounting Brackets, And Screws, 6PK 563H5330B01 100 Lb Capacity Drawer Slides Complete kit for face frame or frameless application , Four-dimensional adjustment tandem fits 1/2 inch - 5/8 inch drawer side thickness. The complete Kit is supplied with 12 runners, 12 locking devices, 12 rear brackets (needed for face frame only application) and screws Blum tandem fits 1/2 inch - 5/8 inch drawer side thickness. with100 lbs static load-bearing capacity, full extension and soft closing.