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As a rule of thumb, the smallest hole diameter a dth hammer can drill is its nominal size. i.e. standard 102 mm (4”) hammer will drill a hole down to a minimum diameter of 102 mm (4”). the limiting factor is the outside diameter of the hammer, because as the hole diameter reduces due to diameter wear of the bit, airflow is restricted.

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.

Bulk buy wood drill bit sets online from chinese suppliers on dhgate. get deals with coupon and discount code! source high quality products in hundreds of categories wholesale direct …

Our corporation primarily engaged and export Down the hole hammer mining dealer. we depend on strong technical force and continually create sophisticated technologies to meet the demand of Down the hole hammer mining dealer shoppers. We're sincerely welcome buddies from many circles at property and abroad come to cooperate!


We are an enterprise that export Down the hole hammer mining dealer to China, we are approved by the relevant state registratio. Primary Down the hole hammer mining dealer and sell to different regions in China, product out there upon request. We've got the spirit of "customer initial, honesty first" principle, using a quantity of enterprises established long-term cooperative connection.

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