Desmond brand DPC-140 : Arca-Swiss compatible QR plate. Dual dovetail design. 140mm (5.5") long. 2 x 1/4"-20 screws (screws have both flat head screwdriver slot & 4mm hex socket, 4mm allen wrench is included) All metal (aluminum). Includes 2 3mm hex safety screws on the underside. 3/8" center threaded socket. Ideal for Nikon and EOS Lenses: 400mm F2.8, 500mm F4, 600mm F4. Please note: will not fit RRS Really Right Stuff Lever clamps.