BEXIN M series of extended SLR camera lens bird watching brackets, compatible with the Yajiakou ball head telephoto lens bracket. Our M Series mounts are designed to enhance your photography experience, providing stability and support for your telephoto lenses. Made of high-quality aluminum alloy, these stands are durable and meet the requirements of professional photography.M Series mounts are available in five different sizes: M150-38, M200-38, M250-38, M300-38 and M400-38, giving you options to suit your specific photography needs. Each size comes with a standard Arca Swiss mount, ensuring compatibility with a wide range of camera equipment. The stand also comes with a 140mm long pole and clamps for extra stability and functionality.