| 摘要 |
In one aspect of the invention, a degradation assembly has an attack tool with a body and a shank, the body having a wear-resistant tip. The shank is disposed within a bore of a holder secured to a driving mechanism. A washer is positioned in-between the attack tool and the holder and fitted around the shank of the attack tool, wherein an outer edge of the washer has a hardness greater than 58 HRc.
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