The 4002 series Camlocs are designed to be used with a metal grommet to help spread the attachment forces. The Flush Grommet mounts in countersunk panels up to 0.117" thick or dimpled panels up to 0.086" thick. Counter-bore or spot-face the back of thicker panels to install these grommets. Thinner panels require the Camloc 4002 Series Flush Grommet for Panels up to 0.086 Inch, Part No. CAM4002-G. Requires minimum 0.150 inch total grip thickness.