WPX40-NL4MP - 40 Port 4 Pole Speakon Wall Plate

Rear terminals are 3/16" male spade connectors for soldering.
As an alternative to soldering you could use crimp female disconnects, found HERE

Plate Specs & Info
Height x Width8.50" x 16.75"
Mounting Info?Mounting info found Here
Old Stock Number?WP4SPK40

WPX40-NL4MP Front View

Front

WPX40-NL4MP Rear View

Rear