The Humanscale M8 Crossbar is a dual monitor desk mount. These arms hold up to two monitors -- each weighing up to 20 lbs.--arranged side-by-side. These are great for more flexibility and functionality since they clear up desk space and you can move around the computer monitors pretty easily. I have 8 of them (each one holds two monitors). They're perfect if you work from home or if you're setting up a small office. These are C-Clamp mounts in the Silver-Gray color. Comes with two VESA plates that support all monitors with 75mm and 100mm VESA hole patterns (pretty standard - should fit most monitors) The M8 Crossbar currently retails for $499. It’s listed on the Humanscale website, so just search M8 crossbar if you want all the specs. These are gently used and in great condition. Price is $250 per crossbar (I have 8, so willing to make a deal if you buy multiple). Note: The arms I have do NOT have the optional grab bar. Keywords: Dual monitor desk mount, Dual monitor stand