Ultrawide Compatibility: Freestanding mount fits 13' to 38' ultra-wide computer monitors weighing up to 22 lbs each with 75x75mm or 100x100mm backside VESA holes -Patented- Strong and Balanced Tempered Glass Base: Provides extra support and increases stability for dual ultra wide screen setups. The rectangular base measures 17 x 12.8 and features bottom-side padding. The pole and arms are made of steel