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2011-6-3 · First Digit: 1, 2, and 3 designate Steel Tooth Bits with 1 for soft, 2 for medium and 3 for hard formations. 4, 5, 6, 7, and 8 designate Tungsten Carbide Insert Bits for varying formation hardness with 4 being the softest and 8 the hardest. IADC CODE REFERENCE. Second Digit:
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