Wow! You trusted the guys at Home Depot for measurements? At my HD, I have literally had to explain what all the little marks between the numbers are! Hopefully, you had a better experience. Personally, I use a metal blade on my chopsaw, then a reamer on the hand-held drill (https://www.amazon.com/gp/product/B00OA02UBS/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1). Using a mini-grinder is also good, just be wary of kickbacks and suck-unders (?) Be sure not to leave wicked bits of metal hanging off the ends!
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