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Ah right, in that case steel conduit is pretty rare full stop.
I've only used it in domestic a couple of times and they were in rather well equipped shed/workshop buildings and a stable block in a garden.
Very rare. A couple of boiler houses in very large premises....with 3 phase supplies, for me.
Although, I have a couple of foot of it in my garage...…...intruders in mind.
 
Your wholesaler will likely have step drills on the shelf
The best one ive used was a Rexel (£70-80 if memory serves me) own brand, they're great for stepping up existing holes in metal or new holes on plastic but they do suffer from losing their edge if you try to start a fresh hole in metals.
 
A sheet metal punch will do an offset centred hole. Just make sure all three pointy bits are biting into metal and you haven't aligned one of the points inside the existing hole.
 
Yes, they let you enlarge a hole like this...

25mm Knockout Metal Clad Boxes. {filename} | ElectriciansForums.net
 
I’m looking for some metal clad sockets. But I need 25mm knockouts. Does anyone know any surface mounted metal clad sockets that have them? MK do some nice ones but they are only 20mm knockouts.
You could enlarge the 20mm with a cone cutter, might work for you
 

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