85mm Quick Release Plate Adapter Clamp with 3/8 Screw Hole for Quick Release Plate Tripod Head of ARCA-SWISS Gitzo Manfrotto
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Amazon.co.jp: PM501 Manfrotto Type Quick Release Plate Arca-Swiss Type Clamp Internal for 501PL / RC3 / RC5 / NG Head with ProMediaGear Strap Port for Video Head and Plate : Electronics
PM501 Manfrotto-Type QR Plate with Arca-Type Clamp | ProMediaGear