1. Universal 1/4in mounting screw is compatible for most of digital and DSLR cameras. 2. Mainly adopting premium aluminum alloy, sturdy structure and for use. 3. Smooth rack and pinion movement provides accurate and fast adjustment of 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 and hep to position camera and focus on subject with high precision. Condition: Maximum load:2-5 kg Weight: . 400g Color: Black Material: aluminum alloy Package Contents: 1 x Rail Slider Camera and other devices are not included. Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.