Humanscale DE400 Corner Sleeve (Discontinued)

DE400 fits desks 1" to 1 1/2" thick

The Humanscale DE400 Corner Sleeve has been discontinued. For a similar product, please visit our sister site and view the Keyboard Trays page.

Desk spreading is here to stay. The Humanscale DE400 Corner Sleeve is an ideal way to increase desktop real estate instantly.

By changing your 90° corner into a diagonal work surface, you can mount your keyboard and move your mouse to the best positions for your work style, improving office ergonomics in the process.


  • DE400 fits desks 1" to 1 1/2" thick
  • Dimensions: 38 1/2" x 13 3/4"
  • Compatible with Humanscale keyboard tray or mouse platforms


DE400 Fits desks 1" to 1/2" thick
Dimensions 38 1/2" x 13 3/4"




Humanscale Corner Sleeve


The two models have the same width and length, but are made to fit desks of different thicknesses.

  • Fits desks 1" to 1.5" thick

4 Reviews Hide Reviews Show Reviews

  • 5
    Looks and fits great!

    Posted by Unknown on Sep 27th 2017

    The DE200-250 option was too small for the corner of the desk, leaving a gap. The DE400-450 solved all our problems- looks and fits great!

  • 5
    Problem solver

    Posted by DeAnn on May 16th 2014

    Extended my desk area perfectly

  • 5
    DE 450 Corner Sleeve

    Posted by STC on Aug 21st 2013

    I believe this is the best corner sleeve on the market. It is a little pricey, but I think it is worth the extra. Large size helps it cove worksurface joints easily.

  • 5
    Simple and effective

    Posted by Abbee on Aug 18th 2010

    This simple device extends the cube surface without all the knobs and levers that are always slipping on the "ergonomic" keyboard trays.

This product comes standard with a 15-year warranty.

Return Information

  • Return windows close 30 days after you receive your item.
  • You are responsible for obtaining a Return Merchandise Authorization, the cost of shipping, and potential restocking fees, if the item has been opened.
  • To start a return, or to view the full returns policy, click here.
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