Would be really nice to have dimensions listed in the specs!
What, you’re not a mind reader like the typical Wooter? 
Overall: 2" H x 12.8" W x 18" D
http://www.wayfair.com/Core-Bamboo-Expandable-Flatware-Large-Tray-in-Natural-FWETXL411-OUN1017.html
But your guess is as good as mine whether that’s expanded or not.