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