1, Diamond core drill bits drilling holes in concrete wet use 2, Fast, smooth drilling and long life ... Diamond core drill bits with brazed segments for concrete wet use1, Suitable in Asia, Russia, Middle east market ... extra long up to 1500mm.6, Available wall thickness: 1.5mm, 2mm, 2.5mm, 3mm.7, All kinds of ... thread adaptors or connections in 1-1/4"UNC, 1/2"BSP,5/8"-11, M14, M16, M42 ...