A super-handy item for any electrician to have around is a step-bit. They look like they could be a gimmicky gadget, but they are not. Step-bit are great for drilling holes in metal, something electricians have to do all the time, like in enclosures.
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| These come in different sizes, or ranges of sizes |
They are expensive but worth it. They excel at drilling in the range between larger drill bits and smaller hole saws, say roughly 3/8" to 1-1/2". Step-bits do a better job than a standard drill bit, or a hole saw, leaving a smooth, clean hole.
Another advantage is the different sizes that come with one step-bit. Often, like in the example below, an odd size is required. A step-bit has many.
Here you can see a metal plate with a hole drilled with a step-bit for a switch:
It looks professional; almost like it was stamped-out with a machine.
When I drilled this hole, I first screwed the plate to scrap lumber. This made it easier and safer to drill. There is always the hazard of a drill bit "grabbing" the work, and it starts spinning. A spinning metal plate like this could easily cause a bad cut.
Here is the finished plate with the switch installed. It looks great.
I used this recessed switch for the LED lights I just installed in my cargo van.
And the step drill bit; I keep it with my electric tools.