The ACC978 provides an interface between Epson PowerLite Projectors 420/425W/430/435W/520/520W/530/535W, Epson BrightLink 536Wi, 3M SCP716 and Promethean PRM-20, or SMART Board UF55/65 projector mount arms.The steel construction of the ACC978 provides strength and stability to support variety of Epson Projectors.