SUNWAYFOTO® brand Arca-Swiss compatible PN-D800 for Nikon D800, D800E cameras. Precision CNC machined from solid aircraft-grade aluminum. Mounting screw: 1/4-20″. Dovetail Width: 55mm. Upper Width: 70mm. Thickness 13mm. Weight: 38g. Length 60mm. All metal construction. Includes 1/4" screw & allen wrench.