Material: AluminumModel: NNR-140Screw Thread: UNC 1 or 4"-20Size: Approx. 17 x 37 x 14cm or 669 x 146 x 055"Jaw can be opened from 40mm to 45mmIt is widely used with fish-eye-lenses and wide-angle lensesSafety stop relief grooves for protecting your camera from accidental dropsMachined from light weight aircraft-grade aluminum, sealing it against corrosion and abrasion, has two safety stop screw on back of plateStandard dual dovetail design, with high contrast built-in bubble level to improve alignmentScale on both sides of the rail to adjust the nodal point conveniently and accuratelyClamp with screw-knob help you locking equipment quicklyAccurately find nodal point for panoramic photographyDesigned with 8pcs UNC1 or 4 screw thread for extended functionPackage Included: 1 x 140mm Nodal Slide Rail Quick Release PlateNote: 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.