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Excellent value, awesome quality. review by Mark Scarletfirearts on 8/14/2018
I bought this bit over a year ago. I taped a 3x5 card to my drill press and put a mark on the card every time I drilled a piece. Most of my work is between 1/4 in. and 3/8 in. thick. I wanted to see how much it cost per use to figure the cost in to my work. I figured I would get 75-100 cuts and the cost would be 40-50 cents per cut. The front of the card is now full and still cutting strong. I counted up the hash marks and got 184. That's far more than i would have ever guessed. I put the bit under the stereo microscope I use to inspect my dichroic resist prior to etching and it still has a whole lot of life left.