... Full range of sizes Diamond core drill bits for concrete,wall,floor,masonry, dry use 1, Suitable in Asia ... Middle east market and so on2, For drilling concrete, reinforced concrete , concrete products ,masonry walls3, Fast drilling ,smoothly and ... , 500mm, extra long up to 1500mm.6, Available wall thickness: 1.5mm, 2mm, 2.5mm, 3mm.7 ... . Diamond core drill bits for concrete,wall,floor,masonry, dry use