Common Roller Cone Bit Dull Characteristics Causes
Some of the dull characteristics listed In Our Bit Dull Grading Guide are self explanatory. More detailed description of the two-letter codes can be obtained from bit companies. Examples of some of the dull characteristics for Roller Cone Bit Design are shown below.

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BROKEN CONE (BC) - Roller Cone Bit Dull Characteristics

The broken cone in this photo was caused by hydrogen sulfide embrittlement.
https://www.drillingmanual.com/2021/03/common-roller-cone-bit-dull-characteristics-causes.html