Keyboard Tray Track Sheath
thingiverse
This is a sheath for the metal mount of an under desk keyboard tray. FEL8017801 - Fellowes Designer Suites Compact Keyboard Tray https://www.amazon.com/gp/product/B00439564O/ 2 of these parts fit on the metal sides before sliding the tray in to it's track. They prevent metal-on-metal.
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