Diamond Core Drill, Core Bits, Diamond Drill for Concrete Top quality with competitive price 1)Diameter: 6-600mm in sizes 2)Connection: M14, M16, UNC1 ... -1/4", 5/8"-11, 22.23mm 3)Top quality with competitive price.Diamond Core Drill Bits for ... bonds and segment designs available upon customer requirments. Diamond Core Drill, Core Bits, Diamond Drill for Concrete