... , Full range of sizes Diamond core drill bits for concrete,wall,floor,masonry, dry use 1, Suitable in Asia, Russia, Middle ... , 400mm, 450mm, 500mm, extra long up to 1500mm.6, Available wall thickness: 1.5mm, 2mm, 2.5mm, 3mm.7, All kinds of ... be provided upon request. Diamond core drill bits for concrete,wall,floor,masonry, dry use