hz-15 type of concrete boring coring machine,construction electric core drilling machine, is applicable for core drilling test for concrete and asphalt road surface at roads. it’s widely used in building construction, road, airport. it features easy operation, flexible, mobile, accurate drilling. the multifunction type can not only do drilling work, but also can cut and rubdown the specimen. technical specifications 1,max boring coring diameter:φ150 2,max boring coring depth:400 3,motor power:2.5kw 4,voltage:220v