The Whirlwind RJ45FF6PNL is an RJ45 chassis mount feed thru connector that offers several mounting variations.
It can be mounted with the supplied metal escutcheon (pictured on the left)
It can be mated with a version of Whirlwind's MDSPL for mounting in any standard rack panel or box that's been pre-punched for Whirlwind or Switchcraft D-Female holes. (Pictured on right, a Neutrik "D" size MDSPL plate is also available.)
Standard Whirlwind wall plates can be punched to accept this feed thru for direct mounting.