Ancable Replacement DC Male Plug Power Supply Ends Solder Type DIY Barrel Connector with Shrink Tube (5.5x2.5mm)- Pack of 4

Effective for what they are needed for but the plastic molding around the barrel is roughly made and has poor finish. Overall a very cheap piece, costing at least double what they should be. I shored it up around the strain relief with a bunch more shrink tube so hopefully it just lasts.

Plug works fine if you just plug it in a leave it. But it is not very robust, probably wouldn't last if repeatedly plugged in and removed.

This barrel fit the Torqueedo battery. Hard to find.

These work great. Don't expect high end audio looks and feel. These are just basic "git r done" stuff. But they work great. They take solder great and the plastic is supportive, provided you use these with the right diameter of wires. Make sure to thread them in all the way when assembling. The silver shoulder should seat below or just inside the black plastic. I see people complaining about strength but then a pic of one incompletely assembled. It can feel tight before it is, that's all. The 4 I assembled are strong and work great. They are long, so make sure that's not a problem. If your looking for audio plugs, keep looking for better than these. For general repairs or hobbies these are perfect.

I ordered both the 2.5 mm and 2.1 mm sizes and they arrived very quickly and for a great low price. I do like that these arrived with both packs containing plenty of heat shrink tubing, pre-cut to length, in two different sizes to permit a nice professional insulated assembly after soldering. I used the smaller size to insulate the solder points and the larger size to add extra support to the cable relief end when using very thin cable. I did have a very minor issue with some of the plugs, which did not affect their use in any way; but I let the supplier know and they responded IMMEDIATELY and issued a full refund! I tried to decline the refund as the product was a great price, but they insisted and stated that their customer satisfaction was most important to them. So, in summary, a good product at a great price form a caring and trustworthy vendor.