I bought these to attach to the inverter cables for my truck. They are fine and did the job but could probably use a little improvement. It has a very soft clamp mount that you put the wire in and you have to crimp the wire with a copper crimp, but the crimp size was quite small and very soft so I found it necessary to break out. soldering iron and make it more industrial. In addition, the clamping teeth are a bit crooked, but it's really more of an aesthetic problem and I don't think it will affect the functioning. Spring seems strong enough and I expect it to last for quite a while.