These are insanely expensive, but if you need to make a huge hole for a conduit, panel button, knob etc., it's the best thing ever. It's rated for steel, so if you just use it on plastic it will last forever
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@piggo How do you prevent accidentally making a bigger hole than intended?

@trinsec that's why there are steps, it's quite easy to stop at the right diameter. They also sell cheaper ones without steps but they have exactly this problem
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