Pro-Line Monitor Arm, Pro-Line Keyboard Tray for HD Series work bench. ARTICULATING MONITOR ARM with 14" x 14" platform. Platform rotates 360°. Price includes clip on keyboard tray and mounting bracket. Extends up to 27.5" from upright. Up to 40 lbs. FSMA FLAT SCREEN MONITOR ARM.  Heavy Duty Monitor Arms feature a 14" x 14" platform.  Used for monitors 40 lbs to 80 lbs.