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UJM 52/55/58/62/67/72/77/82mm Metal Adapter Ring +100mm Square Filter Holder for Haida Lee Hitech Cokin Z PRO 4X4"/5.6/5 Filters|ring bracket|holder switchholder mobile - AliExpress
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Filter Holder 72mm Adapter Ring Blk for Cokin P Series - Walmart.com
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ZOMEI Multifunctional Square Filter Holder&82-82mm adapter Ring for LEE Cokin Z 701470435117 | eBay