Neutrik NC3FD-L-B-1 3-Pin XLRF Black/Gold Chassis Mount w/Solder Cups-by-Neutrik The worldwide standard - In this series the male and female fit in the same hole cut out and are front or rear mountable. The "DL" Series features a two piece unit with solder spring terminations. The "D-L-1" Series features a one piece unit with solder cup terminations. It is RF protected via a 3 point coaxial ground contact to shell of the mated connector. This series is very cost effective.