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When this company, Irwin, goes out of business and has to sell their patents then maybe the next company to manufacture these type of bits will sell them at a reasonable price. $63 for four drill bits, however specialized, is ridiculous. That comes out to $15.75 each.
I have used the #3 to enlarge 15 holes in a 1mm thick carbon steel box.I didn't know if it would stand for that job but it was amazing how easily it cut the steel.No scratches on the bit, excellent finishing.If you need it, don't hesitate to have yours.
Highly recommended for brass and aluminum fabrication. These bits drill smoothly and accurately, and countersinking is a simple operation, too. I haven't used these in ferrous metals, but they are indispensable for drilling and countersinking in brass and aluminum. Twist drills often grab in softer metals, leaving an out-of-round hole.
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