Tianjin Zhongxin North Long concrete drilling drilling services company engaged in engineering, various machines fixed foot hole, ultra deep, large holes (20-400mm), a variety of concrete coring, rock coring, coring road, bridge coring, wall cutting board cutting, cutting parapet, building stones hit the roof open skylight roof drilling holes, door, window, the road between jacking trenchless pipe jacking stair wells punched building body wash load-bearing drill hole Ground slotted hole wall wash walls, floors, wash, wash stones, washed line hole, wash the road, pavement grooving, eye wash hole ,, hit the wall, open hole, bridge wash hole, dismantle, cut, open holes , made a hole in a wall, the hole in the basement to wash, wash, water and drilling, open hole, buildings open hole, ground wash hole drilling, air drilling, drilling hood, floor drilling, borehole wall, load-bearing walls open the door, diamond cutting demolitions, bearing wall drilling, floor removal. Engineering; engineering, drilling, engineering, demolition, engineering, drilling, punching slabs, concrete walls open windows, diamond cut open the door, windows, glass drilling, floor openings, holes line, flue pipe bore hole, gas holes drilled load-bearing walls, heavy wall to open the door, open holes, etc., open staircase wall windows open duct, road cutting, building of reinforced concrete structure drill hole cut, windows price negotiable, interested, contact with my unit .