Atdec Telehook 1040 Ceiling Mount Double Vertical Accessory This accessory is designed for use with the Telehook TH-1040-CTS and TH-1040-CTL. It enables attachment of a second screen in a vertical position. Comes with all mounting hardware included.Key Specifications :Length, single unit (cm)- 22.5Width, single unit (cm)- 22.5Height, single unit (cm) - 9.5