The ones listed on ebay are 11 Amps but it's how heavy they are that matters also the old Harbor Freight Demo Hammers weigh 25 to 30 Lbs. the only special attachment is a ground rod driver,like I said before the new one doesn't look as heavy but I don't know,I do know that one even a little smaller won't work on some of the tougher logs and when the rebar hit knots I'd have to use a sledge Hammer