Bought a couple packs of these to interface modular systems to my mixer. Worked fine for a couple months then developed intermittent connections on the majority of them. Looking inside, it seems like springs get pushed back over time even though I didn't leave them patched in. It appears the plastic body is not as sturdy as it should be.While these guys are cheap, you'll just end up replacing them like I did. The all-metal adapters I bought first are still going strong, I would suggest them over these any day.