This is a red insulated binding post. These binding posts do accept banana plugs, and are a great way to connect single-wire leads. The colored cap screws up and down, and is designed to clamp on the connecting wire.
These binding posts are sold individually. We also carry a similar black binding post.
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Hard to seat and don't lock on to boards and hold as you tighten. Connection was buggy until I overtightened it, worked in the end, but not well.
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Is there some kind of connector that snaps onto the bottom of these binding posts?
I can't find the male plugs, except already on wire. Do you have them with a solder connection?
Unfortunately, we don't. You should be able to find those relatively cheap however at your local electronics store.
So, is this like the “female” for the banana plugs?
As other poster commented, these are very cheap banana jacks. If they weren't so very cheap I would actually be disappointed in SparkFun. As it is, I'll be using these only if I desperately run out of other ones and will be replacing the ones that came with my ATX power supply board.
In case anyone else is wondering like I was; These binding posts fit banana jacks fairly snuggly, but not 100%. I think this is so when you try to unscrew the binding post it doesn't start backing whatever banana plug you have plugged in out. Pretty nice overall though.
These are of fairly crappy quality. I guess that's what you get when you pay 35 cents each, but I ordered quite a few of both colors (red and black) and many of the black ones came scuffed up and looking poor and one of the screws on a red one had snapped so the whole thing was falling apart. If you can afford higher quality then don't get these.
Would you be willing to add this component to the SparkFun.lbr Eagle library? I'm assuming that you have one from this: http://www.sparkfun.com/products/9774
(Alternately: if it is already in the library, what is its name?)
Edit: I see that the Eagle file for the benchtop kit has been posted. Question answered!