Milwaukee 3/8 in. - 1/2 in. #6 Black Oxide Step Drill Bit ...
I have done this before on my Jeep and I remembered that the installation instructions says to drill 7/16 holes to the rear frame. Most drill bit sets do not carry a 7/16 bit. So when I installed my bumper, I had to step up manually from a pilot hole of 1/8”, then to a 1/4, 3/8 and finally to 1/2”. I used lube so as not to burn out the bits.
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