About this item 【DESIGNE】The macro focusing rail slider plate precision focusing through a 115mm adjustment range, With two control knob can be convenient to manual regulation, Helping to achieve exacting camera to-subject distance 【SOLID CONSTRUCTION】Made of metal , durable and solid assures years of corrosion and abrasion-resistant Operation , Hard-anodized anti-oxidation treatment with the surface , so surface smooth 【FLEXIBILITY】The guide rail is driven by a knob-controlled worm gear and an indexing scale, which is printed on both sides of the rail in millimeters to ensure consistency. 【WIDE COMPATIBILITY】Top with 48mm diameter metal thumbwheel with 1/4 "screw , Cameras can be mounted on top of the rail , The base is a 38mm-wide Arca-type plate , with a 3/8 inch bottom screw thread, You can attach it to your for DSLR camera tripod , monopod ballhead video head , etc 【UNIVERSAL】The macro focusing rail has Arca-style dovetail, with 1/4" thread socket, It is compatible with any Arca style plate, such as RRS, Arca-Swiss, KIRK, Wimberley, Markins, Sunwayfoto, Kangrinpoche, Benro, Sirui etc. › See more product details