Chief MNT Dual Disp Hardware Mount Black (K1D220B) Extended length provides an additional 6. 5" of reach versus the K1D120 arm, for over 27" of extension Sleek, solidly-constructed forged aluminum arms in subtlesilver and black finishes Enhancedpatented CentrisExtreme Tilt provides+75 Degree, -10 Degreeof effortless tilt, for optimal viewing comfort whether sitting or standing 13" (330 mm) of dynamic height adjustment using smooth motion gas-spring technology Easily clamps to edge of desk, through standard grommet hole, or through bolt hole withincluded kit