Features:●During macro photography,you can slide the camera by the rail nodal in, it can be moved forward and backward in a wide range, and out without moving the tripod,reducing the frequency of adjusting the tripod,and greatly improving the efficiency and stability of shooting.excellent for panoramic and close-up photography.●Standard dual dovetail design,It is compatible with any Arca style system, such as RRS, Arca-Swiss, KIRK, Wimberley, Markins, Sunwayfoto, Kangrinpoche, Benro, Sirui etc.●CNC precision machined from light weight aircraft grade aluminum, which is very durable and portableSpecifications:●Model: NNR100●Material: Aircraft Grade Aluminium●Attachment Thread: 1/4"●Mounting Thread：1/4"●Width of Close Jaw: 38mmPackaging List:●1*NNR100 Professional Camera Rail Nodal Slide Metal Clamp