... drill bits drilling holes in concrete 2, Fast, smooth drilling and long life 3, Full range of sizes Diamond triple core drill bits with brazed segments for ... to reduce cost2, For drilling concrete, reinforced concrete , concrete products ,masonry walls3, Fast drilling ,smoothly and long life;4, Available diameters from ... All kinds of thread adaptors or connections in 1-1/4"UNC, 1/2"BSP,5/8"-11, M14, M16 ...