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suitable for round rails and such as motorcycle bicycle handlebar clamp mount, clamp range is 1.5-4cm/0.59-1.57 inch Thickening the inner wall can increase the friction force of the ball for head, clamp it firmly, and slipping With 1-inch ballhead base at both ends, 360 degree rotating ball for head, provides you perfect viewing angles materials, anti-shock and stable to use Includes 25mm adapter ballhead, double socket arm and mounting base