Snug fit and works well.
These work as expected. The pins insert very snug so they won't fall out. The wires are as thick as most snap 2.5mm and 3.5mm male lead wires but thicker than the female lead connector wires I have on my Tens unit.<br />Would like to find black and red colors to match existing leads but that's not a necessity. :-)
Rating: 5 stars