Before spending that kind of money for something you'll use once, pull
the hinge pins and take the door to your local lumber yard, or a machine
shop. They'll make the hole for you, and I doubt it will cost over $10.
But there have been lots of other good advice too.
Plus, dont you know any friends or relatives with tools? A 6pack of
beer will probably get the job done by one of them.
And finally, before you drill that hole, are you sure you need it?
I ask because once at work I was told to drill holes in steel doors
for a similar peephole.
I found the doors were all solid, but - next to a window. (like a
motel room setup)
I couldn't see any point in the peephole, it didn't seem to add any
security to what was already there. Of course my boss told me to do
it anyway, so I did, but at least I raised the issue first.
Since I already had a set of wood-boring spade bits that included 1", I
went ahead and used it successfully, working with a 1/8" pilot hole and
both sides toward the center. Turns out that the thickness of the
cladding is only 1/32" and the core is foam. Here's what I used:
Many thanks to all for your helpful comments. Dennis was right about the
type of bit to use, despite being designed for wood.
As Dennis said, it's really a soft steel. A magnet sticks to it. The
seal around the door is also magnetic, like on a refrigerator, for a
good weather-proof seal.
My micrometer gives the actual thickness of the steel as 0.026".
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