Product DescriptionSize: 180mm * 160mmColor: BlackMaterial: PlasticPackage content: 1 * Hongyuntai1. Specification: aluminum four-way macro focus slider. There is a 1/4 inch standard screw that fits most Nikon, Minolta, and Pentax macro and bellows, macro lens extension tubes, or Canon FD and FL macro lenses.The 4-way macro focus slider in four directions can be adjusted in four directions by using two knobs: forward, backward, left, and right. (After adjustment, please tighten the knob to prevent slight movement of the camera. After setting up, please.)3. The quality assurance slide rail adopts a sturdy and durable aluminum slider, and adopts a gear transmission system to improve accuracy. The forward locking knob ensures a solid rock focus.4. Providing excellent focus adjustment focus rails is a necessary accessory for macro photography. It requires precise distance adjustment and a stable palm, as well as precise positioning of the camera in other situations. It can easily adjust the camera distance, and smooth rack and pinion motion can provide extremely fine focus adjustment.