[Cnc Technology for Stability] Processed with cnc technology, this mount is lightweight yet sturdy, with stainless steel screws for added stability. [All-direction Rotation] Easily fix your lens onto a tripod with this , allowing for smooth rotation in all directions to meet your photography needs. [Designed for Lenses] Specifically designed for 100-400mm f4.5-6.3 di vc usd lenses, with a 2-stage design and knob for convenience. [Durable Aluminum Alloy Material] This lens collar mount is made of aluminum alloy, ensuring durability and longevity for users. [Compatible with Various Standards] The quick installation board is compatible with multiple ptz standards, making it suitable for a wide range of photography equipment.