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Wood Working Hardened Hole-making Carbide Drill Bits For Plank Or Board Materials Product Descriptions: It is applicable to the hole drilling in the plank or board materials. By using the mixed tungsten cabide tips, it successfully solves the problem of burr, low precision etc when using the normal drill bits. It could provide the good finish on both in-and-out hole end. It is the most ideal drilling tools for thin thickness of plank & board at present. Product Code D L Left