SUNWAYFOTO brand Arca compatible Multi-Purpose Rail DPG-210R. Fully Really Right Stuff Lever Clamp Compatible. Precision CNC machined nodal slide. Compatible with all Arca style quick-release plates. Accurately find nodal point for panoramic photography. For close-up photography, slide the camera in and out without moving the tripod. Width: 39mm Length: 200mm Height: 10mm Weight: 132g Mounting hole: 1/4-20″ 1. Precision machined from solid aircraft-grade aluminum. 2. Hard -anodized finish, durable and resists scratches. 3. Sliding backstop to secure long lenses. 4. Easy-recognized laser-engraved scale on both sides of the rail to adjust the nodal point conveniently and accurately. 5. Safety stop screws included. All metal construction Includes allen wrench 2 stop screws and 2 x 1/4" cap hex screw