The guitar jack. It looks like it says Dimarzio, but I'm not 100% sure. It's got a boost circuit built in, but I don't care about that - I just want the flat mount jack plate with a locking jack.
Yes, this it a neutrik jack. My lp has one.. Kinda cool as it wontcome undone when I step on my chord while playing. Kinda a pain to undo as I have to make sure and press the button and pull the cable to release it. but its a small price to pay
When I step on my guitar cord or get it snagged on something, I'm better off with it coming unplugged. I'd rather pick up the cord and plug it back in than knock my stack over.