Fotasy Vertical Grip Holder for Sony Alpha A7 / A7R Digital Camera Aviation grade aluminum exquisite craftsmanship. Surface hard oxidation treatment, feel comfortable, is not easy to wear. Specially designed for Sony Alpha A7 A7R Mirror less Digital Camera, can be used vertically, Compatible with RRS/ARCA-SWISS/KIRK/Wimberley/MARKINS, SUNWAYFOTO/kangrinpoche/BENRO SIRUI AS ball head, don't affect the use of shutter release cable and change batteries. Fotasy is a registered trademark