SUNWAYFOTO DPG-210R Multi-Purpose Rail, one piece CNC cutting machined from light weight aircraft-grade aluminum, stain anodized surface finish for better abrasion and corrosion resistant. Arca-Swiss style. The most important function of this product is that it can accurately take the lens axis as the nodal point when in panoramic photography. So that to maximize the realization of seamless panoramic shoot. At the same time, when in close-up photography, this product allows the large-scale back/front shifting adjustment. So that can reduce the moving of the tripod and make your shooting efficiently.