IADC CODE IDENTIFICATION:

. First Digit: 1, 2, 3 and 4 are further breakdown of formation with 1 being the softest and 4 the hardest.

Ⅲ.Third Digit: 1. Standard open bearing roller bit

3. Standard open bearing roller bit with gauge protection which is defined as carbide inserts in the heel of the cone

5. Sealed roller bearing bit with gauge protection

7. Journal sealed bearing bit with gauge protection