Material: Aluminum<br> Model: NNR-140<br> Screw Thread: UNC 1/4"-20<br> Size: . 17 x 3.7 x 1.4cm/ 6.69 x 1.46 x 0.55"<br> Jaw can be opened from 40mm to 45mm<br> It is widely used with fish-eye-lenses and wide-angle lenses<br> Safety stop relief grooves for protecting your camera from accidental<br> Machined from light weight aircraft-grade aluminum, sealing it against corrosion and abrasion, has two safety stop screw on back of plate<br> Standard dual dovetail design, with high contrast built-in bubble level to improve alignment<br> Scale on both sides of the rail to adjust the nodal point conveniently and accurately<br> Clamp with screw-knob help you locking equipment quickly<br> Accurately find nodal point for panoramic photography<br> Designed with 8pcs UNC1/4 screw thread for extended function<br> Package Included: 1 x 140mm Nodal Slide Rail Quick Release Plate<br> Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.