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 0.074" thick or dimpled panels up to 0.065" thick. Thicker panels require the Camloc 4002 Series Flush Grommet for Panels to 0.117 Inch, Part No. 6083. Requires minimum 0.090 inch total grip thickness.