Knockout tools are widely accepted as the best method of punching conduit-size holes in steel electrical panels, boxes and other steel surfaces. While hole saws and step bits on conventional drills and carbide cutters also can cut metal, none can produce a hole as precisely and cleanly as a knockout tool. Basic knockout tool components are punch and die, draw stud and the mechanism to pull the stud—a hand wrench, a hand-powered hydraulic pump or electrically powered hydraulics.
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