Greenlee 734 Double D Punch Set, 1-1/8 x 1-3/8 | eBay
50124749 Greenlee | Greenlee Punch and Die Tool, 43.4 x 12.9mm, 25 Way D F, Hydraulic Operation | 477-8729 | RS Components
Greenlee 0.642 Inch Hole Diameter x 0.769 Inch Hole Length x 16.3mm Wide, Double D, Knockout Punch Unit Hydraulic and Manually Operated, 14 Gauge Max in Mild Steel 61086 - 04225496 - Penn Tool Co., Inc
Greenlee 36506 - 1-7/32" Standard Knockout Punch Assembly
GREENLEE, 14 ga Sheet Metal Capacity (Steel), 3/4 in Nominal Size, Knockout Punch and Die Kit - 4JA56|61007 - Grainger