We have different connector of drill bits such as M14, M12 and G1/2. We can supply ... according to your specification. We can supply top quality core bits for processing vanity tops, countertops made of marble and granite ... . We have different connector of drill bits such as M8, M12, M14, 5/8"-11 and G1 ... to North America, Germany, Spain with large quantity. Core Drill Bits