60077 Greenlee Tools, Hole Punch, D-Type with Die & Draw Stud, 12.7mm
Greenlee 61092 0.913" x 0.756" Double "D" punch unit
GREENLEE Hydraulic Knockout Punch Set (NIH571) | Linen Plus
Punch Unit - 15/16" | Greenlee
Greenlee Manual Knockout Punch Set | Lowe's Canada
Greenlee Slug-Buster 7238SB Manual Knockout Punch Die Kit, 10 ga Capacity, For Use With Battery Powered/Hydraulic Ratchet Driver and 3/8 in and 3/4 in Draw Stud, 1/2 to 2 in Conduit/Pipe, Mild Steel
tools - D-punch/die set for SMA panel cut-out - Electrical Engineering Stack Exchange
Special Application Punch Accessories | Greenlee
Punch & Die Set-1/2"-2" Slug Buster | Greenlee
Greenlee 61086 Double D Punch Unit, 0.769-Inch by 0.642-Inch : Amazon.ca: Tools & Home Improvement
Greenlee 61080 Knockout Punch Unit .625 x .594 In - Hand Tool Knockout Punches - Amazon.com