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Four-Fin Stepped Desk Mail Sorter
A desktop mail and envelope sorter, 110 x 96 mm on the desk, with four fins that lean back 12° and step up from 35 to 80 mm tall. Between the fins are three 19 mm lanes, so bills, letters and #10 envelopes (105 x 241 mm) stand upright and stay readable instead of piling up. Each fin has a thumb notch for pulling out the item behind it, and the fins are 2.4 mm thick with flared roots so they don't snap off at the base.
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