3Pcs 312/4-12/20Mm Hss Cone Step Drill Bit Hex Shank 610830928650

3Pcs 312/4-12/20Mm Hss Cone Step Drill Bit Hex Shank 610830928650

1、Not require center punch, Compared with ordinary twist drill bits, these step drill bits are not easy to break, which can be used for deburring,

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