Reinforcement Plate: Pure steel material plate to better reduce the pressure of the monitor arm on the desktop. Protects the desktop from scratches and breakage by distributing weight load. Increased Stability: The monitor stand is made more stable by increasing the force area of the desktop. Anti-Skid Design: Prevent the desktop from scratching or scuffing by sticking on 2 pieces anti-skid pads. 2 Mounting Methods: Two-piece design with preset holes fits most clip and grommet bases. Large Mounting Plates: Upper plate 7.48"x6", lower plate 4.72"x2.76", thickness about 0.16", middle hole diameter 0.433"