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Nice and massive soviet ceramic sockets PLK-50MD (ПЛК-50МД) with construction made of special aluminium alloy (used in engine constructions). Sockets are suitable for tubes like GU-50 (ГУ-50), 5C9S (5Ц9С), GU-15 (ГУ-15) and others. New old stock sockets in perfect condition. Year of production: 1971.