Made of imported aviation aluminum and precision processed by a high-precision CNC machining center, this tripod mount collar ring is strong, stable, and wear-resistant. The inner flocking cloth surface helps protect the lens from scratches, and the exterior features electroplated and painted finish for durability. This accessory enhances stability when using a telephoto lens with a tripod. Install the lens by attaching it to the tripod via the tripod socket located under the mount. Loosen the rotation lock knob to rotate the camera around the lens axis, allowing smooth switching between portrait and landscape orientations without adjusting the pan/tilt head. To attach the tripod ring: Turn the locking knob counterclockwise until the arrow aligns with the dot, then pull the knob outward to open the ring. Place the lens into the open ring, position as desired, then tighten the locking knob to secure. To remove, follow the reverse procedure. The tripod ring is compatible with ring tripod heads. Type: A-Regular / B-Upgraded Color: Creamy White Material: Aluminum Alloy Size: Fits lenses 100-400mm Package Contents: 1 x Tripod Mount Collar Ring Note: Lighting conditions and monitor settings may cause slight variations in color. Measurement allows for an error of +/- 1-3 cm.