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1.Designed with a Variable Helix that with an aggressive 35° cutting edge which ends at 15° 2.With Rapid Chip Removal to limit heat buildup to Stay Sharper Longer.

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ChipBreaker Impact Hex Shank Variable Helix Chip Breaker HSS Drill Bit for Metal_China Drill Bits Manufacturers, Factory, Wholesale - Good Prices

ChipBreaker Impact Hex Shank Variable Helix Chip Breaker HSS Drill Bit for Metal_China Drill Bits Manufacturers, Factory, Wholesale - Good Prices

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