DescriptionDurable, rustproof, and light weight. Made of advanced aviation aluminum with the general machining of precious CNC. IR guarantees a lot of time and stability. It protect the socket of the camera lens and ensure it wouldn't been interrupted by loosening.Feature- Color: Black. - Material: Aluminum Alloy. - Size: 7 x 6 x 3.5cm. -Installation: Loosen the lock knob,and press the safety lock down,then slide this device into the lens amount.It will be installed safely after releasing the safety latch and tightening the lock knob. - Detachment: Loosen lock knob again,press down the safety lock,then pull out the device with even strength. - Durable: Made by material,durable and lightweight. - Fit with Nikon70-200 VR VRII / F2.8.Warm Tip: Dear buyer, Due to lighting effect, monitor's brightness, manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. Sincerely hope that you can understand! Thank you!