1. These drill bits are made from high-speed steel for high hardness and durability, Sturdy and having long service time. 2. The twist design is adopted to center the tool tip and improve the cutting accuracy.
1. These drill bits are made from high-speed steel for high hardness and durability, Sturdy and having long service time. 2. The twist design is adopted to center the tool tip and improve the cutting accuracy.
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