EXMAX 26cm/10.2in 2 Way Macro Shot Focusing Focus Rail Slider 1/4" Quick Screw Release Mount Camera Flash Support Plate for Canon Nikon Pentax Olympus Sony and Other DSLR with Standard 1/4" Screw Made of aluminum alloy,designed for digital DSLR cameras and used for macro photography, or film negatives taken. The 2 way macro slider's smooth rack and pinion movement provides extremely fine focusing adjustments and positive locking knobs assure rock-steady focus. Macro focusing rail slider is essential accessories for macro photography,it helps macro photographers to position camera and focus on subject with the great precision. One rail allows movement in 2 directions: forward and backward.Move Range: 100mm/3.9in. Suitable for all DSLR or DC with standard 1/4" screw hole.