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Pneumatic crawler drill mining dth hammer bit factory for gold mining equipment. company introduction : xiamen zhao xing electrical equipment co., ltd. was established in 1996, with extensive experience in drilling area.

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.

9/16 to 1-1/4", 118° point, oxide finish, high speed steel reduced shank drill bit set 10 piece, standard point, 6" oal, 1/2" shank diam msc# 02387587 hertel in stock

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