... 9001;High quality OEM is ok. Hard alloy deep hole drill in deep holeTungsten tip with alloy stell shankDifferent specifications.OEM ... is ok. High quality;Passed ISO:9001Mainly used for deep hole drilling, well drilling, metal drilling, masonry drilling, wood ... etc. Applicable to the deep hole processing machinery, machining center, turning center etc satisfy gun drill cooling and guidance request the ...