From imported aerospace grade aluminum using high precise machining, this durability and wear resistant adapter features a plushie interior lining to protect your lens from scratches Enhances your photography stability with our upgraded tripod mount Collar, ensuring precise and stable each time Easy installation and secure locking mechanism, this tripod mount Collar becomes indispensabled accessory for enhancing the versatility and performances For EF lens For professional photographers who frequently use telephoto lens for capturing distant subjects precisely Perfectly for outdoor, sports event, and wildlife observation where long stable photograpgy is essential, allowing seamlessly change between horizontal and vertical compositions