Durable, 1 thick top for open storage . Drawers with full extension slides hold all different sizes of files: letter, legal or European size hanging files. Patented, interlocking safety mechanism allows only one drawer open at a time for peace of mind. Drawers lock for secure storage of your key documents. Quick and easy assembly with patented T-lock drawer system. Meets BIFMA standard x5.9 for safety, durability, and structural performance. Finished in Prime Oak.