... range of sizes Diamond core drill bits for concrete,wall,floor,masonry, dry use 1, Suitable in Asia, Russia, ... on2, For drilling concrete, reinforced concrete , concrete products ,masonry walls3, Fast drilling ,smoothly and long life;4, ... 450mm, 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