IDEAL 1/4-in Flex Auger Bit in the Auger Bits department at

IDEAL Serrated flexible drill bit, type C 1/4 in. x 54 in. is used to drill holes through wood within a wall. The screw point tip pulls the bit through wood. A convenient hole in the tip allows for use with wire or cable pulling grips to pull wire back through hole.

IDEAL 1/4-in Flex Auger Bit in the Auger Bits department at

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Since they don't make 2mm drill bits for concrete, is it best to