The industry standard for knockout punches, Greenlee screw- or hydraulic-actuated two-piece piloted dies are designed to make holes in sheet metal for conduit and instruments. But what about for the weekend warrior or the guy starting out in the trade? Harbor Freight has a set of four for only $15.99, about a tenth of the price of a set of Greenlee punches. You can of course find used Greenlee brand punches for much less, if you’re lucky.
The real question is whether the Harbor Freight set works well enough, actually makes clean holes, and can survive more than one or two uses. So we ask, Hot or Not?