This is a set of twist drill: HSS fully ground drill is used for wood、 metal、 copper and iron. The material is 6542, this is the most cost-effective product. 135° split point improves positioning accuracy and reduces drilling resistance. 6542 HSS 13pc Fully ground Tin coating drill has a higher performance than 4341. The Hardness can reach 63°-66°, this material can make drilling more easier and it also can extend the service life.

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