1 What does Isolated mean? - Each connector has a non-conductive mounting washer added during install. This provides insulation from the plate and other connectors to reduce ground loop concerns.

2 Type of Face Plate? - Bulkhead face plates will have 3.5mm on the front and 3.5mm on the rear. Solder Point plates will have 3.5mm on the front and solder points on the rear.

3 What does 1/2 D or 3/8 Round mean? - This simply refers to the connector mounting holes in each plate. The 1/2 D type plates have 1/2 D shaped holes. The 3/8 Round type plates have 3/8 Round shaped holes.