Specification:made of metal, 650g, light but sturdy and durableThe rail adopts durable metal slider, and a geared drive system which enhances accuracy and speed of adjustment of the rail greatly. with two precise double scales, and allows precise distance modifications;the rail allows 5cm moving leftward/rightward, and 10cm moving forward/backward; The rail positioning adopts adjustable locking knob, and there is a 1/4" standard screw that fits most of professional DSLR.

Package:4 way Macro Focus Rail Slider (black)*1unit

Macro Focusing Rail Tripod Head with 4 Way Fine Control for Macro Photography