Hilitchi 40 Pcs Binding Posts Terminals 4mm Banana Plug Socket (20pcs) + Red and Black Gold Plated 4mm Banana Plugs(20pcs) for Arduino

A++. . . Excellent binding post plugs & socket connectors better than many other brands we bought before. Its construction is much stronger and more rigid, it is securely attached to any material where you install it.The plugs connectors have screws to adjust cables and wires of gauges number 10 onwards as well as you can solder if you want. And the best of all is that when you insert the plug into the sockets it "goes in" without problems and stays fixed without being loose or coming out due to any movement.((( Not like other brands that we have bought before that are loose: - The connectors are loosened from the cases, the diameter is not the same as the plug, others enter the socket connector with difficulty that until many times don't fit well or the plug must be closed a bit or open a bit it depending on the situation and this affects terribly when taking measurements and electronic calculations for not having good contact between plug & socket- )))Great connectors make our safest and most reliable Electronic Life. We were also impressed by the gold plated that it has as this prevents oxidation and there is no static or bad conductivity between connector and plug, as well as when connecting it has no resistance due to sulfur oxidation and it enters smoothly. Those from oldies or cheap quality brands that they sell you a lot for a couple of dollars "when they rusted and sulfated" you must sanded to remove that rusty layer to get enter to make contact...We are very happy with those banana binding post set. . . Definitely we will buy more next month for our Solar Project Program... We recommended 100%Thanks!

Worked as expected.

These connectors offer reasonable value for their cost, as long as you manage your expectations accordingly. They are priced affordably, and their quality is aligned with their price point.The set screw is relatively short, making these connectors suitable for thicker cables, such as 12 AWG, commonly used in speaker setups. However, if you're planning to use thinner cables, like 18 AWG or those with minimal insulation, you might encounter difficulties.Each plug I received had its leaf springs collapsed—these are the flexible metal strips around the sides of the plug. Despite this, they are soft enough to manually adjust with a small screwdriver. This fix is a temporary solution, as the springs tend to easily collapse back to their original state, which makes these connectors less ideal for setups that require frequent unplugging.The material used is relatively soft, possibly too thin, which can lead to issues when tightening the set screw, resulting in a connection that may become loose over time and no longer adjustable.For their price, these connectors are adequate if you keep your expectations low. However, they are not suitable for projects where durability and frequent manipulation are needed.If they were a tad more expensive I'd rate them with three stars or less, but at their price point, I think they are OK. I would not buy them again though.

1. The plugs are design to work with 12AWG stranded copper wire (speaker cable). I was trying to use them with 18 to 22 gauge wire with no luck. For once I decided to keep the product and make it fit.I made 5-inch leaders of 14AWG solid copper wire and was able to get the little pins to hold the wire snugly. The little pins still were sticking out so I ground them down with the bench grinder. Then I soldered the much thinner 18 to 22 gauge wire onto the 14 guage leaders.2. The plugs don't hold snugly in the receptacles. I used a razor blade to expand the metal frame on the banana plugs and now they hold a little better.3. The receptacles are held together with screw threads on the outer plastic bezel. It is very easy to strip the threads and have the receptacle fall apart.It should be noted that I am trying to use the banana plugs in a manner that is inconsistent with their normal use. I just wish there was more description warning about how to use them. That is why it is three stars instead of one star.

If I could complain about anything it would be nice to get more for the price but that's because, why not. This was exactly what it says it is. If you read some of the comments the ones that are negatives I did not encounter. I'm a diyer so if it is for a bigger gauge wire I'll make a bigger connection. The one about not being able to connect it to metal probably didn't actually remove the nuts and the plastic posts in the middle that the metallic shaft goes through. But hey if it's too difficult to figure out buy something that someone else made and don't be a diyer

I didn't expect Pomona quality for this price but I did expect something usable. The sockets are okay except the mounting screw does not have an insulating washer, therefore can't be mounted in a metal case without rigging some sort of insulation. On the other hand, the plugs are totally unusable because the splined shafts are not splayed enough to fit tight in the socket. This can be manually corrected, but five splines per plug times 20 plugs is a lot of unnecessary work. The photos show the plugs as received (inner), and after splaying the splines out (outer). Also, the set screws for the plugs are too short and too loose to be usable. Bottom line: It's cheap junk like this that gives Chinese products in general an undeserved bad reputation.

Real nice, good enough quality to be used for most all applications.

They work, ok, barely. The set screw for holding wire in is very easily stripped out. Plastic has very low quality moulding. I'm using them 'til I run out and they all break, and they're functional, but really are lowest tier.