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Good day, We urgently require simetrix DTH drill bit with ballistic facing for drilling in mud formations. The size of the casing pipe is 146 mm. Attached is the normal simetrix drill bit drawing for your size reference. Please reply ASAP because this is a very urgent matter! If we will arrange this now we will win a client that will use your boring tools. Best regards, Arshad Mahir Foreign Trade Activity Chief FTA specialist Arshad Mahir +7 495 902 60 94; +7 916 274 70 07 *******@*****.com