Material: Aluminum Model: NNR-140 Thread: UNC 1/4"-20 Size: Approx. 17 x 3.7 x 1.4 cm / 6.69 x 1.46 x 0.55" Jaw Opening: 40 mm to 45 mm Ideal for use with fisheye and wide-angle lenses. Safety Stop Screws: Protect your camera from accidental drops. Aircraft-Grade Aluminum: Machined from lightweight aircraft aluminum, sealed against corrosion and wear. Dual Dovetail Design: Features a standard dual dovetail design with a high-contrast built-in bubble level for precise alignment. Adjustable Scale: Scales on both sides of the rail allow for convenient and accurate nodal point adjustment. Quick-Release Clamp: The clamp with a screw knob allows for fast equipment locking. Nodal Point Finder: Precisely locate the nodal point for panoramic photography. Expanded Functionality: Designed with 8 UNC 1/4" threads for extended use. Package Included: 1 x 140mm Nodal Slide Rail Quick Release Plate (Note: Light and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowable measurement error is +/- 1-3 cm.)