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€16.39
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1/4" whitworth starting Ball for underwater use, equipped with a hex insert on the top, allowing the ball to be easily tightened with an Allen key. On the bottom, a 1/4" whitworth thread of approximately 7 mm protrudes.
The 1/4" whitworth thread, together with the 3/8” whitworth thread, is a widely used standard for mounting on tripods, camera supports...