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1" flute length, 1/2" diameter, 1/4" shank dia., double-cut cylinder-radius-end tungsten carbide burs cost about $20 each. You can get slightly smaller flute length and diameter for around $15 each. I've never found any of these burs at anything but industrial supply stores or online, and the prices above are about the cheapest I've found anywhere, and that was from online stores.
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-Mack
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