The "Grappler" - This 1" spacer block is used to position the toggle clamp further under your desk or table. This allows the toggle clamp foot to bypass a lip, notch, or any other protrusion or indention on the underside of the edge of your desk, in order to attach your mount more securely. Please be sure to select either "Hunter" or "Stalker" series, to match the color scheme of your Predator Desk/Table Mount.
*** This can be used with all sized vertical beams EXCEPT the 4" Ultra Compact Vertical Beam for the Tracker Rail System.***