5pcs Titanium Coated M42 High Speed Steel Cobalt HSS Twist Drill Bits

5pcs Titanium Coated M42 High Speed Steel Cobalt HSS Twist Drill Bits

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Description
Steel is a super-hard cobalt high-speed tool steel containing cobalt, with good toughness, high wear resistance, high cutting efficiency, and good hot hardness (Retains hardness even at high temperatures of the cutting edge.).
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