I put one of these in a dremel tool to cut a 2" high x 3" wide hole in a stainless steel case no these bits cut that hole and threw pieces of steel at me and I mean they cut the hole the same as if it were plastic except of course it was a bit slower but after making the one and only bit I used it was very sharp and I cut 2 holes for timers to use track engine consumption (hour meter). These are the best parts I have ever seen or bought in my own life! AND SIDING GUYS YOU WILL LOVE THIS! Cutting siding around outlets and the like.
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