Features: 1.Universal 1/4in mounting screw is compatible for most brands of digital and DSLR cameras. 2.Mainly adopting premium aluminum alloy, sturdy structure and durable for use. 3.Smooth rack and pinion movement provides accurate and fast adjustment of the rail. 4.It allow movement in four directions, right, left, forward and backward, with precision scale to get quick focusing. 5.Perfect for close-up shooting and hep to position camera and focus on subject with high precision. Specification: Condition: 100% Brand New Main Material: Aluminum Alloy Color: Black Screw: 1/4" Size: Approx. 18 * 16.5 * 9cm / 7.1 * 6.5 * 3.5in Weight: Approx. 414g Packing List: 1 x Rail Slider( Camera and other devices are not included.) Contains only the above package contents and does not include other products. NOTE: Lighting and different monitors may cause the color of the item in the picture to differ slightly from the actual item. The measurement allowable error is +/-1-3cm.