... range of sizes Diamond core drill bits for concrete,wall,floor,masonry, dry use 1, Suitable in Asia, Russia, Middle ... east market and so on2, For drilling concrete, ... 450mm, 500mm, extra long up to 1500mm.6, Available wall thickness: 1.5mm, 2mm, 2.5mm, 3mm.7, ... upon request. Diamond core drill bits for concrete,wall,floor,masonry, dry use