It is made of aviation aluminum and precision processed by a high-precision machining , which is strong, stable and wear-resistant; the inner flocking cloth surface will not scratch the lens body, and the surface is electroplated and painted. An accessory enhances stability when using a telephoto lens and with a tripod. Install the lens and fix the lens to the tripod through the tripod socket under the tripod mount. In addition, you can rotate the camera around the lens by loosening the knob of the tripod mount, and you can switch between portrait and landscape composition without tilting the /. Attaching and removing the tripod. Turn the knob counterclockwise to align the with the dot. Then pull the knob outward to open the loop. Place the lens in the tripod ring when the ring is open. Loosen the knob of the tripod ring, you can turn the camera and lens mounted on the tripod, and freely switch between horizontal and vertical directions. Turn the camera to the position and tighten the knob. The tripod ring can be used on the ring tripod head. Types:A-Regular Colour:Creamy white Material:Aluminum alloy Size:100-400mm Contents: 1 x Tripod Mount Ring Only the above content, other are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.