1, Diamond core drill bits drilling holes in concrete wet use 2, Fast, ... drilling and long life 3, Full range of sizes Diamond core drill bits with brazed segments for concrete wet use1, Suitable ... 500mm, 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, CRI28 ...