Blue Glacier Side Load Letter Tray is convenient desktop organization. Stacks securely to create a convenient form of desktop organization. Durable, injection molded design features a ribbed bottom to prevent paper from sticking. Compatible with most other manufacturers' models and built in handles make trays easily portable. Compatible with other OIC large sorter, large incline sorter, 9 compartment Desk Accessories / Drawer Trays and drawers to form combination desk accessory storage units. Made in USA.