It is made of imported aviation aluminum and precision processed by a high-precision CNC machining center, 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 that enhances stability when using a telephoto lens and shooting 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 rotation lock knob of the tripod mount, and you can switch between portrait and landscape composition without tilting the pan/tilt. Attaching and removing the tripod ring Follow the procedure below to attach the tripod ring, and follow the reverse procedure to remove the tripod ring. Turn the locking knob counterclockwise to align the arrow 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 locking knob of the tripod ring, you can turn the camera and lens mounted on the tripod, and freely switch between horizontal and vertical shooting directions. Turn the camera to the desired position and tighten the locking knob. The tripod ring can be used on the ring tripod head. Types:A-Regular/B-Upgraded Colour:Creamy white Material:Aluminum alloy Size:100-400mm Package Contents: 1 x Tripod Mount Collar Ring Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.