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Greenlee punches are an easy way to create holes in metal. You drill a 3/8" hole, then insert the die and leadscrew thru the hole, then screw the punch portion onto the leadscrew. Turning the leadscrew draws the punch thru the metal into the die, leave a clean hole with smooth edges. It takes seconds. Punches are available for holes ranging from 1/2" to over 4-inches. Metric sizes are also available.

The part number for the 3/4-inch size is 730-3/4.