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What makes cobalt HSS countersinks better than standard HSS?

Cobalt HSS (HSS-E) with 5-8% cobalt has better red hardness and withstands higher cutting temperatures; wear resistance improves 2-3x with 3x the tool life of standard HSS; suited for difficult materials like stainless steel and high-temperature alloys. Lihao Technology uses imported cobalt HSS bar stock for stable quality.

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