Purchased one of these for a welder in our shop (who requested it) to expedite welding nuts to steel plates. I inquired regarding current rating prior to purchase and was told the ground brush was rated for 80 amps. I was concerned it may be marginal for our use but for the price figured I would give it a try. I've spot checked with our welder since who said he has used it in the 110amp range with no issues. I will admit I was originally a bit of a skeptic figuring it was going to be cheap junk and not hold up but so far it's held up quite well and saves our welder a lot of time.