The OEM 30540 Heavy Duty Document Sorter provides the quickest, easiest way to sort and file purchase orders, invoices, checks, letters, and other office documents. Its heavy-duty pressboard construction is durable and features insertable metal tabs and plastic windows. This sorter includes five indexing systems on 31 letter-size dividers: alphabetical (A-Z), numerical (0-2,000), monthly (January-December), dates (1-31), and days of the week (Sunday-Saturday).