File:Chassis punches round and square disassembled.jpg - Wikipedia
Round Hole Punch / Hole Cutter (65mm dia.)
Sheet metal knockout punch
PUNCH
Lichamp Manual Knockout Punch Kit, Heavy Duty Metal Sheet Knock Out Box Hole Cutter Conduit Punch Driver Die Set : Amazon.co.uk: DIY & Tools
VEVOR VEVOR 6 Die 10 Ton Hydraulic Knockout Punch 1/2" to 2" Hand Tool Cutter Driver Kit, Holesaw Set Cutter Tool Saw Electrical Conduit Metal Drill | VEVOR UK
Round Hole Punch / Hole Cutter (52mm dia.)
25mm CHASSIS PUNCH
GreenLee 13/16" round chassis or radio (not conduit/pipe) punch for ma - The Electric Brewery