HM-ANT Quick Release QR L Plate Vertical Bracket For Canon EOS 1DX Arca Swiss C:\Users\Administrator\Desktop\FITTEST\LB-F1DXL CNC Machined,Black Anodized,made of Aircraft Aluminium Fast Portrait & Landscape Switching Arca-Style Dovetail on Both Segments,has 4 safety stop screws Arca-Swiss standard compatible with Arca Swiss, RRS, kirk, Wimberley, Markins, Sunwayfoto, Benro, Suri, Fotopro ball head of AS standard interfaces