SUNWAYFOTO PC-1DX QR Plate QR Canon EOS-1D X Camera Body Arca Compatible PC-1DX QR plate for Canon EOS-1D X Dovetail Width: 39mm Precision CNC machined from solid aircraft-grade aluminum. SUNWAYFOTO brand Arca-Swiss compatible Includes 2 safety stop screws, 1 x 1/4" screw and allen wrenches.