... 9001;High quality OEM is ok. Hard alloy gun drill in latheTungsten tip with alloy stell shankDifferent specifications.OEM ... drilling, well drilling, metal drilling, masonry drilling, wood drilling and PCB drilling,concrete, clinker, masonry, stone, granite etc. ... machinery, machining center, turning center etc satisfy gun drill cooling and guidance request the equipment of carbon steel, stainless steel ...