Under Desk Drawer Organizer 21" White Upgrade with Adjustable Brackets, Sliding Pull-Out Under Table Pencil Drawer, Office Standing Desk Attachment for Workbench

Upgrade Adaptation. Perfect for tables With or Without 2 Max Height Crossbar. The drawer comes with a pair of pre-assembled flush brackets for flat bottom desks. There is also a pair of adjustable extentended brackets that, when attached to the flush brackets, allow the drawer to be mounted under a table with a cross-beam no higher than 2 inches. Specifically, the extension brackets have 3 adjustable levels: 2cm, 3cm and 5cm adapt to different height beams. Great for room desk accessories & dorm organizer, practical for workspace standing desk drawer attachment.
Work Smoothly: The guide rails are smooth but firm in movement when sliding. The large wide drawer opens more than 90% way, rather than only halfway. The detent of the slide-rail prevents drawer from drifting open due to accidental collision. It's thin in height, hardly noticeable hidden drawer, and will not touch your knees when sitting down.
Easy to Install: The drawer, the slides and the basic flush brackets come fully assembled.
Your steps: A. Install the handle, B. (Optional) Connect the extension brackets, C. Screw the drawer under the table. Based on users feedback, the installation will take about 5-20 minutes.
Note: 1. If there is no beam under the table, perform steps A and C; 2. If there is a beam under the table and the beam height is less than 2" / 50mm, perform steps A, B, and C.