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Standards is the German standard (DIN) , American Standard (ANSI) , British standard (BS) , grading has a307, 4.8 grade, 8.8, copper, the United States and English-inch length of 0-144, the German-made length of 0-6 meters. Our businesses principle is the "quality first, customers first", to provide customers with the most excellent quality, preferential prices and good sales service. Sincerely hope that you will become our trading partner!!