... drill bits drilling holes in concrete wet use 2, Fast, smooth drilling and long life 3, Full range of sizes Diamond core drill ... bits with brazed segments for concrete wet use1, Suitable in Asia, Russia, Middle ... .5mm, 2mm, 2.5mm, 3mm.7, All kinds of thread adaptors or connections in 1-1/4"UNC, 1/2"BSP,5 ...