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China leading provider of dth hammer bits and dth drill bits, hunan new diamond construction machinery co., ltd. is dth drill bits factory.

Dth drilling tool ql50 down the hole dth drill bits 105-130mm diameter black 2 inch dth drill bits , down the hole hammer bits for shank br2 api 2 3/8'' thread blue color 165mm 3 wings drag bits for water well drilling

Use one hand to hold the drill bit in place. tighten the jaws of the drills chuck by turning the metal chuck key with your other hand in a clockwise manner. tighten the chuck jaws as firmly as possible. remove the chuck key, and take your hand off the bit. test the drill to see if it is drilling properly.

Wholesale 13pc drill bit set. wholesale 13 pack drill bit set hardened and tempered, alloy steel construction. precision roll forged flutes. multi purpose bits are ideal for wood or plastic.

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