Exactly what it says, Neutrik NL4 connector. Has 4 pins, they have 3/16" (.1875") wide flat connectors and are clearly labeled on the back (1+, 1-, 2+, 2-). Mounts in a 1" hole (body diameter .930"), 3/4" deep (to the start of the pins). As long as your connecting wires and connectors don't take up more space, you can install it in thicker materials. 2" OD, .1785" thick. Bolt circumference is 1.318" so basically 1-5/16, and bolt holes are .157" diameter (maybe #6-32 spacing?). Probably all the metrics i use for jack dj subwoofers i built by connecting the NL4 jacks on the amps to these NL4 jacks on the subwoofers they work great!
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