Amazon.com : Neewer 2 Pieces Standard 1/4 to 3/8 inch Metal Male Convertor Threaded Screw Adapter Spigot Stud for Studio Light Stand, Hotshoe/Coldshoe Adapter, Ball Head, Wireless Flash Receiver, Trigger : Electronics
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Walimex pro Spigot Adapter 5/8"-11/16" – Thomann United States
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Impact Double Flat-Edge Spigot Adapter CA-119 B&H Photo Video
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Female Spigot for 026, 1/4''-20F and 3/8''F, 31mm Long Adapter - 119 | Manfrotto US
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