10 Pcs 4mm Banana Jack Female Panel Mount Banana Socket Binding Post Adapter for 4mm Banana Plug Connectors

Worked as expected. Fit well. Good value. Connected well too.

Overall these were great and I'll buy them again next time I need some. They locked securely with the nut, and fit 1/4" spade terminals. She the images if you need dimensions. Some of the other reviews mentioned the holes being off-center. All of these were fine for me. I would definitely buy them again.

Perfect

Did not find any with the center post being off-centered but did find the screw nut is looser than necessary and can be easily cross-threaded. The base material seems to be brass but it is tin plated. The only part that is found to be magnetic is the thin washer. Tested one of each color for voltage drop with a 10A load and found it to vary between 30-32mV so not too bad. Insertion force is smooth and reasonable. Will buy again if needed.

Useful for electronic projects.

Just what I expected.

Not industrial grade but they work

I have bought two packs of these 4 mm sockets for some high voltage test boxes. I do not recommend them for serious work. First, some came with the center socket misaligned (see pic). One other one was in a test box I had built and the metal connector part got pushed out of the back of the plastic molding by inserting a shielded plug. The box was live with 450 V DC at the time. The final thing is that the nuts supplied are very loose fitting on the plastic threads and require a two-pronged tool to tighten them up.