Feature:1. WIDE COMPATIBILITY: Bi directional for Arca standard 38mm bay design. The metal camera rail sliding clip is 38mm wide, compatible with any for Arca system, fits most ball heads, and maximizes seamless stitching for panoramic photography.2. MULTI PURPOSE: With for Arca standard knob jig, precisely laser engraved, scale and level, perfect for panoramic and macro photography. Fixture with knob stops at maximum opening.3. BUBBLE LEVEL: The guide rail node sliding clips have a built in bubble level to ensure precise horizontal orientation of the photography. Easily recognizable laser scales on both sides of the rail make it easy to accurately adjust the nodes.4. 1/4 INCH SCREW HOLE: With multiple screw holes for mounting microphones, flashes, panel lights and more photography accessories for outdoor shooting, live streaming or any video shooting.5. EASY TO INSTALL AND REMOVE: The quick release clamp with knob has a lightweight design and is very easy to install and remove, so you can quickly loosen, rotate and reattach the camera.6. MATERIALS AND PROCESS: Rail nodal slide clamp is made of aluminum alloy and precisely CNC technology. The plates are very strong and durable with good texture and smooth surface.Specification:Item Type: Rail Nodal Slide ClampMaterial: Aluminum AlloyWeight: Approx. 273g / 9.6oz.Package List:1 xRail Nodal Slide Clamp1 x Wrench