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Versatile Use: Compatible with M42 lenses, T2 rings, and other astronomical or photography equipment. Threading: M42x0.75mm double-sided T2 male design ensures accurate alignment and fit. Lightweight Aluminum: Made from aluminum alloy for strength without adding extra weight. Reliable Coupling: Ensures stable connection between telescope tubes, lens adapters, and accessories. Package: Includes 2 M42 male-to-male adapter rings for versatile telescope or lens setup.